P. The upper-part, or top-timber of the fashion-piece.
n,o,p,q,r,s. The radii of the floor-sweeps, abaft the midship-frame: those before the midship-frame are on the opposite side of the line A F, to which they are all parallel.
1st Rd. 2d Rd. 3d Rd. 4th Rd. The diagonal ribbands abaft the midships.
t,u,x,y. The same ribbands expressed in the fore-body.
It has been remarked above, that the horizontal plane is composed of water-lines and ribbands; it also contains the main and top-timber breadth-lines, or the longitudinal lines by which the main-breadth and top-timber-breadth are limited in every point of the ship’s length. The horizontal curve of the transoms and harpins are also represented therein, together with the planes of the principal timbers; the cant of the fashion-piece, the length of the rake afore and abaft, the projection of the cat-heads, and the curve of the upper-rail of the head, to which curves of the lower ones are usually parallel.
B A C. The line of the ship’s length, passing through the middle of the stem and stern-post.
B. The upper-end of the stern-post.
C. The upper-end of the stem.
B F. The length of the rake abaft.
D W X. The top-timber-breadth-line, or the line which limits the breadth of each top-timber.
D F. The breadth of the aftmost timber at the taffarel.
B K. The wing-transom.
B L P. The horizontal curve of the deck-transom.
M M. The horizontal curve, orround-aft, of the first transom.
M N. The horizontal curve of the second transom: it is prolonged into a water-line, N 8 7.
kO. The horizontal curve of the third transom, which is also prolonged into another water-line, O,n, U,p, Q.
mO P. The plane of the fashion-piece, as canted aft.
⊕ W U. The plane of the midship-frame.
a,b,c,d,e,f,h. The planes of the timbers before the midship-frame.
1, 2, 3, 4, 5, 6, 7, 8, 9. The planes of the timbers abaft the midship-frame.
X X. The figure of the upper-rail of the head.
C Y. The projection of the knee of the head.
The Third horizontal ribband, is marked on the plate.
a a. The projection of the cat-head.
Thus we have endeavoured briefly to explain the nature and uses of the principal draughts used in the construction of a ship, which reciprocally correspond with each other in the dimensions of length, breadth, and depth. Thus the plane of elevation is exactly of the same length with the horizontal or floor-plane. The several breadths of the timbers in the floor-plane and that of the projection are mutually transferable; and the real height of the timbers in the projection, exactly conforms to their height in the elevation. Thus let it be required to transfer the height of the wing-transom from the elevation to the projection:
Extend the compasses from the point K, in the elevation, down to the dotted line prolonged from the upper-edge of the keel, and setting the other foot in the pointp, then shall the line Kpbe the perpendicular height of the wing transom: transfer this from the middle of the line B A C, in the projection, to the point K in the perpendicular A F, then will A K be the height of the wing-transom in the plane of projection: and thus the height of all the transoms may be laid from the former upon the latter.
Again, let it be required to transfer the main-breadth of the midship-frame from the projection to the horizontal plane: Set one foot of the compasses in the point ⊕ on the perpendicular C E, and extend the other along the main-breadth-sweep ⊕ G, till it touches the perpendicular A F parallel to C E: lay this distance upon the horizontal plane from the point u in the line of the ship’s length, B A C, along the plane of the midship-frame to the point ⊕; so shall the line ⊕ W U be the breadth of the midship-frame on the horizontal plane.
Thus also the top-timber-breadth, or the distance of each top-timber from the middle of the ship’s breadth, may be in the same manner transferred, by extending the compasses from the line B A C, in the horizontal plane, to the top-timber breadth-line, upon any particular timber, as 1, 2, 3, &c. which will give its proper dimensions thereon.
In the same manner the breadths of all the timbers may be laid from the projection to the horizontal plane, andvice versa, from that to the projection. Thus the height of each timber may also be transferred from the elevation to the projection, &c.
The principal utility of these draughts therefore is to exhibit the various curves of the ship’s body, and of the pieces of which it is framed, in different points of view, which are either transverse or longitudinal, and will accordingly present them in very different directions. Thus the horizontal curves of the transoms and water-lines are represented on the floor-plane, all of which are nearly streight lines in the elevation and projection; and thus the vertical curves of the timbers are all exhibited on the projection, although they appear as streight lines in the elevation and floor plane.
Before this article is closed, it may be necessary to remark, that the various pieces represented in plateI. as well as the lines in the draughts which have not been already defined, are copiously explained in their proper places; as it would have been contrary to the plan of this work to have given a more enlarged description of them here.
That the reader, however, might be better enabled to comprehend the scope of this article, it was judged necessary to give a general sketch of naval architecture itself; to collect into one point of view the most material draughts by which a ship is constructed, and to describe, as concisely as possible, the several parts of which they are composed.
The principal parts of a ship also, which are here reduced into a narrow compass, will be represented at large in different places of this work, to illustrate those explanations whither it may be necessary to refer, in order to understand the subject more clearly. Thus the stern, the quarter, the midship-frame, the bow and head, of a ship of 74 guns, are exhibited on a scale of ¼ of an inch to a foot; by which all the subordinate parts may be distinctly viewed, and their combination and arrangement sufficiently understood.
ARMED-SHIP,vaisseau armé en guerre, a vessel occasionally taken into the service of the government in time of war, and employed to guard some particular coast, or attend on a fleet. She is therefore armed and equipped in all respects like a ship of war, and commanded by an officer of the navy, who has the rank of master and commander. All ships of this sort are upon the establishment of the king’s sloops, having a lieutenant, master, purser, surgeon, &c.
ASHORE, (fromaandshore) on the shore, or land, as opposed to aboard.
A ship is said to beAshore,echoué, when she has run upon the ground, or on the sea-coast, either by design or accident.
ASTERN,au derriere, (fromaandsteorn, Sax.) any distance behind a ship, as opposed toa-head, which is before her. Thus, when south isa-head, or on the line to which the stem is directed, north will beastern.
ATHWART,par le travers, (fromaandtwert, Dan. transverse) when used in navigation, implies across the line of the course; as, we discovered a fleet at day-break standingathwartus, i. e. steering across our way.
Athwart-Hause, the situation of a ship when she is driven by the wind, tide, or other accident, across the fore-part of another. This phrase is equally applied when the ships bear against each other, or when they are at a small distance; the transverse position of the former to the latter being principally understood.
Athwartthe fore-foot, a phrase employed to denote the flight of a cannon-ball, as fired from one ship across the line of another’s course, to intercept the latter, and compel her to shorten sail till the former approaches near enough to examine her. Thefore-footis the lower part of the stem; so that the shot flying across it is said to be firedathwart the fore-foot.
Athwart-Ships, reaching across the ship, from one side to the other.
ATRIP (trepor, Fr.trippen, Dutch) is applied differently to the anchor and the sails. The anchor isatrip,derangée, when it is drawn out of the ground in a perpendicular direction, either by the cable or buoy-rope. The top-sails are said to beatrip, when they are hoisted up to the mast-head, or to their utmost extent.
AVERAGE, in commerceavarie, (averagium, Lat.) the accidents and misfortunes which happen to ships and their cargoes, from the time of their loading and sailing, till their return and unlading. It is divided into three kinds. 1. The simple or particularaverage, which consists in the extraordinary expences incurred for the ship alone, or for the merchandise alone; such is the loss of anchors, masts, and rigging, occasioned by the common accidents at sea; the damages which happen to merchandises by storms, capture, shipwreck, wet, or rotting; all which must be borne and paid by the thing that suffered the damage. 2. The large and common average, being those expences incurred, and damages sustained, for the common good and security, both of the merchandise and vessels, consequently to be borne by the ship and cargo, and to be regulated upon the whole. Of this number are the goods or money given for the ransom of the ship and cargo; things thrown overboard for the safety of the ship; the expences of unlading, or entering into a river or harbour, and the provisions and hire of the sailors when the ship is put under embargo. 3. The small averages, which are expences for towing and piloting the ship out of, or into harbours, creeks, or rivers; one third of which must be charged to the ship, and two thirds to the cargo.
Averageis more particularly used for a certain contribution that merchants make proportionably towards their losses. It also signifies a small duty which the merchants, who send goods in another man’s ship, pay to the master, for his care of them, over and above the freight. Hence it is expressed in the bills of lading, paying so much freight for the said goods, with damage and average accustomed.
AWEIGH,a quitté(ofaandweigh) the state of the anchor when it is drawn out of the ground in a perpendicular direction, by the application of mechanical powers, as a capstern or windlass, to the cable within the ship; so that aweigh is synonimous toatrip.
AWNING,tendelet, (fromaulne, Fr.) a canopy of canvass extending over the decks of a ship in hot weather, for the convenience of the officers and crew, and to preserve the decks from being cracked or split,ebaroui, by the heat of the sun: The awning is supported by a range of light posts, called stanchions, which are erected along the ship’s side on the right and left; it is also suspended in the middle by a complication of small cords, called a crowfoot. See the articleCrowfoot.
AZIMUTH-Compass, an instrument employed to discover the magnetical azimuth or amplitude of any heavenly object. This operation is performed at sea, to find the exact variation of the magnetical needle. The compass will be described in its proper place: it is, however, necessary here to explain the additional contrivance by which it is fitted to take the magnetical azimuth, or amplitude of the sun or stars, or the bearings of head-lands, ships, and other objects at a distance.
The brass edge, originally designed to support the card, and throw the weight thereof as near the circumference as possible, is itself divided into degrees and halves; which may be easily estimated into smaller parts if necessary. The divisions are determined by means of a cat-gut line stretched perpendicularly with the box, as near the brass edge as may be, that the parallax arising from a different position of the observer may be as little as possible.
There is also added an index at the top of the inner-box, which may be fixed on or taken off at pleasure, and serves for all altitudes of the object. It consists of a bar, equal in length to the diameter of the inner-box, each end being furnished with a perpendicular stile, with a slit parallel to the sides thereof; one of the slits is narrow, to which the eye is applied, and the other is wider, with a small cat-gut stretched up the middle of it, and from thence continued horizontally from the top of one stile to the top of the other. There is also a line drawn along the upper surface of the bar. These four, viz. the narrow slit, the horizontal cat-gut thread, the perpendicular one, and the line on the bar, are in the same plane, which disposes itself perpendicularly to the horizon when the inner-box is at rest and hangs free. This index does not move round, but is always placed on, so as to answer the same side of the box.
The sun’s azimuth is known to be an angle contained between the meridian and the center of the sun. When this is required, and his rays are strong enough to cast a shadow, the box is turned about till the shadow of the horizontal thread, or if the sun be too low, till that of the perpendicular thread, in one stile, or the slit through the other, falls upon the line in the index bar, or vibrates to an equal distance on each side of it, the box being gently touched if it vibrates too far: at the same time they observe the degree marked upon the brass edge of the cat-gut line. In counting the degree for the azimuth, or any other angle that is reckoned from the meridian, the outward circle of figures upon the brass edge is used; and the situation of the index, with respect to the card and needle, will always direct upon what quarter of the compass the object is placed.
But if the sun does not shine out sufficiently strong, the eye is placed behind the narrow slit in one of the stiles, and the wooden box turned about till some part of the horizontal, or perpendicular thread appears to intersect the center of the sun, or vibrate to an equal distance on each side of it; smoked glass being used next the eye, if the sun’s light is too strong. In this method another observer is necessary, to note the degree cut by the nonius, at the same time the first gives notice that the thread appears to split the object.
PlateII. fig. 20. is a perspective view of the compass, when in order for observation; the point of view being the center of the card, and the distance of the eye two feet.
A B. is the wooden box in which it is usually contained.
K. is a cat-gut line drawn from the inside of the box for determining the degree upon the brass edge.
L, M, N, O. is the index bar with its two stiles, and cat-gut threads, which being taken off from the top of the box, is placed in two pieces P Q, notched properly to receive it.
The other parts of the figure, with their references, are explained in the articleCompass.
BACKof the post. See the articleStern-post.
ToBackan anchor,empeneller, to carry out a small anchor, as the stream or kedge, ahead of the large one, by which the ship usually rides, in order to support it, and prevent it from loosening, orcoming home, in bad ground. In this situation, the latter is confined by the former, in the same manner that the ship is restrained by the latter.
ToBackastern, in rowing,scier à culer, is to manage the oars in a direction contrary to the usual method, so as that the boat or vessel impressed by their force, shall retreat, or move with her stern foremost, instead of advancing.
ToBackthe sails, is to arrange them in a situation that will occasion the ship to retreat or move astern. This operation is particularly necessary in narrow channels, when a ship is carried along sideways by the strength of the tide or current, and it becomes requisite to avoid any object that may intercept her course, as shoals, or vessels under sail, or at anchor: it is also necessary in a naval engagement, to bring a ship back, so as to lie opposite to her adversary, when she is too far advanced in the line. SeeAback.
BACK-BOARD, a piece of board of a semicircular figure, placed transversely in the after-part of a boat, like the back of a chair, and serving the passengers to recline against whilst sitting in the stern-sheets. SeeBoat.
BACK-STAYS,cale haubans, (frombackandstay) long ropes reaching from the topmast-heads to the starboard and larboard sides of the ship, where they are extended to the channels: they are used to support the top-masts, and second the efforts of the shrouds, when the mast is strained by a weight of sail in a fresh wind.
They are usually distinguished into breast-back-stays and after-back-stays; the intent of the former being to sustain the top-mast when the force of the wind acts upon the ship sideways, or, according to the sea-phrase, when the ship sails upon a wind; and the purpose of the latter is to enable it to carry sail when the wind is further aft.
There are also back-stays for the top-gallant-masts, in large ships, which are fixed in the same manner with those of the top-masts.
A pair of back-stays is usually formed of one rope, which is doubled in the middle, and fastened there so as to form an eye, which passes over the mast-head, from whence the two ends hang down, and are stretched to the channels by dead-eyes and laniards. SeeDead-eyes, &c.
The figure of the back-stays, and their position, is exhibited in the articleRigging, to which the reader is further referred.
BADGE,bouteille, fausse galerie, in ship-building, a sort of ornament, placed on the outside of small ships, very near the stern, containing either a window, for the convenience of the cabin, or the representation of it: it is commonly decorated with marine figures, martial instruments, or such like emblems. SeeQuarter.
To BALANCE, (balancer, Fr.) to contract a sail into a narrower compass, in a storm, by retrenching or folding up a part of it at one corner; this method is used in contradistinction toreefing, which is common to all the principal sails; whereas balancing is peculiar to few, such as the mizen of a ship, and the main-sail of those vessels, wherein it is extended by a boom. SeeBoomandReef.
TheBalanceof the mizen,fanon, is thus performed: the mizen-yard is lowered a little, then a small portion of the sail is rolled up at thepeek, or upper corner, and fastened to the yard about one fifth inward from the outer end, or yard-arm, toward the mast. SeeMizen.
A boom-main-sail is balanced, after all its reefs are taken in, by rolling up a similar portion of the hindmost, or aftmost lower-corner, called theclue, and fastening it strongly to the boom, having previously wrapped a piece of old canvas round the part (which is done in both cases) to prevent the sail from being fretted by the cord which fastens it.
BALLAST,lest, (ballaste, Dut.ballastro, Span.) a certain portion of stone, iron, gravel, or such like materials, deposited in a ship’s hold, when she has either no cargo, or too little to bring her sufficiently low in the water. It is used to counter-ballance the effort of the wind upon the masts, and give the ship a proper stability, that she may be enabled to carry sail without danger of over-turning.
There is often great difference in the proportion of ballast required to prepare ships of equal burthen for a voyage; the quantity being always more or less, according to the sharpness or flatness of the ship’s bottom, which seamen call thefloor.
The knowledge of ballasting a ship with propriety, is certainly an article that deserves the attention of the skilful mariner; for although it is known that ships in general will not carry a sufficient quantity of sail, till they are laden so deep that the surface of the water will nearly glance on the extreme breadth amidships; yet there is more than this general knowledge required; since, if she has a great weight of heavy ballast, as lead, iron, &c. in the bottom, it will place the center of gravity too low in the hold; and although this will enable her to carry a great sail, she will nevertheless sail very heavily, and run the risk of being dismasted by her violent rolling.
To ballast a ship, therefore, is the art of disposing those materials so that she may be duly poised, and maintain a proper equilibrium on the water, so as neither to be toostiff, nor toocrank, qualities equally pernicious; as in the first, although the ship may be fitted to carry a great sail, yet her velocity will not be proportionably increased; whilst her masts are more endangered by her sudden jerks and excessive labouring: and in the last, she will be incapable of carrying sail, without the risk of oversetting.
Stiffness in ballasting, is occasioned by disposing a great quantity of heavy ballast, as lead, iron, &c. in the bottom, which naturally places the center of gravity very near the keel; and that being the center about which the vibrations are made, the lower it is placed, the more violent will be the motion of rolling.
Crankness, on the other hand, is occasioned by having too little ballast, or by disposing the ship’s lading so as to raise the center of gravity too high, which also endangers the mast in carrying sail when it blows hard: for when the masts lose their perpendicular height, they strain on the shrouds in the nature of a lever, which encreases as the sine of their obliquity; and a ship that loses her masts is in great danger of being lost.
The whole art of ballasting, therefore, consists in placing the center of gravity to correspond with the trim and shape of the vessel, so as neither to be too high nor too low; neither too far forward, nor too far aft; and to lade the ship so deep, that the surface of the water may nearly rise to the extreme breadth amidships; and thus she will be enabled to carry a good sail, incline but little, and ply well to the windward. See the articleTrim.
BANIAN-Days, a cant term among common sailors, denoting those days on which they have no flesh-meat: it seems to be derived from the practice of a nation amongst the eastern Indians, who never eat flesh.
BANK,banc, atterrissement, (banc, Sax.) an elevation of the ground, or bottom of the sea, which is often so high as to appear above the surface of the water, or at least so little beneath it, as to prevent a ship from floating over it: in this sense, bank amounts nearly to the same as shallows, flats, &c. The shelves that abound with rocks under water, are distinguished by other names, as reefs, ridges, keys, &c.
An exact knowledge of the banks, their extent, and the different depths of water in which they lie, constitutes a very essential portion of the science of a pilot, or master of a ship. If the vessel be large, and draws much water, great attention will be necessary to avoid them. If, on the contrary, she is small, the same banks afford a sure asylum, where she may brave the largest ships, which dare not follow her to so dangerous a retreat. Many small vessels have eluded the pursuit of a superior enemy by means of this hospitable barrier.
Bankson the sea-coast are usually marked by beacons or buoys. In charts they are distinguished by little dots, as ridges of rocks are characterised by crosses. The principal banks in the Western Ocean, are those of Newfoundland, and the Bahama-Bank: the most remarkable one in Newfoundland is called the Grand Bank, which is of a vast extent, being nearly two hundred miles in length, and stretching north and south: its usual depth is from twenty to eighty fathoms: and this is the great scene of the cod-fishery, which is so material an article in European commerce.
Bankof oars, a seat or bench of rowers in a galley.
BANKER, a vessel employed in the cod-fishery on the Banks of Newfoundland.
BARof a port or haven, a shoal or bank of sand, gravel, &c. thrown up by the surge of the sea, to the mouth of a river or harbour, so as to endanger, and sometimes totally prevent the navigation.
BARCA-LONGA, a large Spanish fishing-boat, navigated with lug-sails, and having two or three masts: these are very common in the Mediterranean. SeeVessel.
BARGE (bargie, Dutch) a vessel or boat of state, furnished with elegant apartments, canopies, and cushions; equipped with a band of rowers, and decorated with flags and streamers: they are generally used for processions on the water, by noblemen, officers of state, or magistrates of great cities. Of this sort we may naturally suppose the famous barge or galley of Cleopatra, which, according to Shakespeare,
———————‘Like a burnish’d throneBurnt on the water; the poop was beaten gold;Purple her sails, and so perfumed, thatThe winds were love-sick with them: the oars were silver,Which to the tune of flutes kept stroke, and madeThe water which they beat to follow faster,As amorous of their strokes————At the helmA seeming mermaid steer’d: the silken tacklesSwell’d with the touches of those flower-soft-handsThat yarely form’d their office.’——
———————‘Like a burnish’d throneBurnt on the water; the poop was beaten gold;Purple her sails, and so perfumed, thatThe winds were love-sick with them: the oars were silver,Which to the tune of flutes kept stroke, and madeThe water which they beat to follow faster,As amorous of their strokes————At the helmA seeming mermaid steer’d: the silken tacklesSwell’d with the touches of those flower-soft-handsThat yarely form’d their office.’——
———————‘Like a burnish’d throneBurnt on the water; the poop was beaten gold;Purple her sails, and so perfumed, thatThe winds were love-sick with them: the oars were silver,Which to the tune of flutes kept stroke, and madeThe water which they beat to follow faster,As amorous of their strokes————At the helmA seeming mermaid steer’d: the silken tacklesSwell’d with the touches of those flower-soft-handsThat yarely form’d their office.’——
———————‘Like a burnish’d throne
Burnt on the water; the poop was beaten gold;
Purple her sails, and so perfumed, that
The winds were love-sick with them: the oars were silver,
Which to the tune of flutes kept stroke, and made
The water which they beat to follow faster,
As amorous of their strokes——
——At the helm
A seeming mermaid steer’d: the silken tackles
Swell’d with the touches of those flower-soft-hands
That yarely form’d their office.’——
There are likewise other barges of a smaller kind, for the use of admirals and captains of ships of war. These are of a lighter frame, and may be easily hoisted into, and out of the ships to which they occasionally belong. SeeBoat.
Barge,cabotiere, is also the name of a flat-bottomed vessel of burthen, for lading and discharging ships, and removing their cargoes from place to place in a harbour.
BARK (barca, low Lat.) a general name given to small ships: it is however peculiarly appropriated by seamen to those which carry three masts without a mizen top-sail. Our northern mariners, who are trained in the coal-trade, apply this distinction to a broad-sterned ship, which carries no ornamental figure on the stem or prow.
BARNICLE,cravan, a species of shell-fish, often found sticking to the bottoms of ships, rocks, &c.
BARRICADE (barricada, Span.) a strong wooden rail, supported by several little pillars or stanchions, and extending, as a fence, across the foremost part of the quarter-deck. In a vessel of war, the intervals between the pillars are commonly filled with cork, junks of old cable, or matts of platted cordage. In the upper-part, there is a double rope-netting, supported by double cranes of iron, extending about a foot above the rail; and between the two parts of the netting are stuffed a number of hammocks, filled with the seamens bedding, to intercept and prevent the execution of small-shot fired by swivel guns, carabines, or muskets, in the time of battle.
BARSof the Capstern and Windlass. See those articles.
BASINof a dock, (bassin, Fr.) a place where the water is confined by double flood-gates, and thereby prevented from running out at the tide of ebb. The use of it is to contain ships whilst repairing, either before they enter, or after they come out of the dock.
Basin,paradis, also implies some part of a haven, which opens from a narrow channel into a wide and spacious reservoir for shipping.
BATTENSof the hatches, a sort of long narrow laths, scantlings of wooden stuff, or streight hoops of casks. They are nailed along the edges of tarpaulings, which are pieces of tarred canvas, of sufficient breadth and length to cover the hatches at sea; the battens serve to confine the edges of the tarpaulings close down to the sides of the hatches, to prevent the water, which may rush over the decks in a storm, from penetrating into the lower apartments of the ship.
BAY,baye, a gulf or inlet of the sea-coast, comprehended between two promontories, or capes of land, where shipping frequently ride at anchor, sheltered from the wind and sea.
BEACON,balise, (beacon, Sax.) a post or stake erected over a shoal or sand-bank, as a warning to seamen to keep their ships at a distance.
BEAK-HEAD,coltis, a name given to a ship’s head whose forecastle is square or oblong, a circumstance common to all vessels of war which have two or more decks of guns. In smaller ships, the forecastle is nearly shaped like a parabola, whose vertex, or angular point, lies immediately over the stem.
The strong, projecting, pointed beaks used by the antients in time of battle, have been intirely rejected since the use of gun-powder.
BEAMS,baux, (beam, Sax. a tree) strong thick pieces of timber, stretching across the ship from side to side, to support the decks, and retain the sides at their proper distance.
TheBeamsof ships of war are usually formed of three pieces scarfed together; as appears in plateIII. They are sustained at each end by thick planks in the ship’s side, called clamps, upon which they rest. They are also firmly connected to the timbers of the ship by means of strong knees, and sometimes by standards. SeeMidship-Frame.
It is necessary that the beams, as represented in the midship-frame, should have a greater height in the middle than at the two ends, to carry the water more readily off from the decks, and to diminish the recoil of the guns, which will thereby more easily return into their places.
The longest of these is called themidship-beam; it is lodged in the midship-frame, or between the widest frame of timbers. At about two thirds of the height from the keel to the lower-deck, are laid a range of beams, to fortify the hold, and support a platform called the orlop, which contains the cables and stores of the ship.
There are usually twenty-four beams on the lower-deck of a ship of seventy-four guns, and to the other decks additional ones in proportion, as the ship lengthens above.
On theBeam, implies any distance from the ship on a line with the beams, or at right angles with the keel: thus, if the ship steers or points northward, any object lying east or west, is said to be on the starboard or larboardbeam. Thus also,
Before theBeam, is an arch of the horizon comprehended between the line that crosses her length at right angles, and some object at a distance before it, or between the line of the beam, and that point of the compass which she stems. Thus if a ship, steering west, discovers an island on the right, three pointsbefore the beam, the island must bear N W b N from the ship. See the articleBearing.
BEAN-COD, a small fishing-vessel, or pilot-boat, common on the sea-coasts and in the rivers of Portugal. It is extremely sharp forward, having its stem bent inward above into a great curve: the stem is also plated on the fore-side with iron, into which a number of bolts are driven, to fortify it, and resist the stroke of another vessel, which may fall athwart-hause. It is commonly navigated with a large lateen sail, which extends over the whole length of the deck, and is accordingly well fitted to ply to windward.
BEAR-a-hand!a phrase of the same import with make haste, dispatch, quick, &c.
BEARING, in navigation,gissement, an arch of the horizon intercepted between the nearest meridian and any distant object, either discovered by the eye, or resulting from the sinical proportion; as in the first case, at 4 P. M. Cape Spado, in the isle of Candia, bore S by W. by the compass.
In the second, the longitudes and latitudes of any two places being given, and consequently the difference of latitude and longitude between them, the bearing from one to the other is discovered by the following analogy:
As the meridional difference of latitudeIs to the difference of longitude:So is radiusTo the tangent bearing.
As the meridional difference of latitudeIs to the difference of longitude:So is radiusTo the tangent bearing.
As the meridional difference of latitudeIs to the difference of longitude:So is radiusTo the tangent bearing.
As the meridional difference of latitude
Is to the difference of longitude:
So is radius
To the tangent bearing.
Bearingis also the situation of any distant object, estimated from some part of the ship according to her position. In this sense, an object so discovered, must be either ahead, astern, abreast, on the bow, or on the quarter.
TheseBearings, therefore, which may be called mechanical, are on the beam, before the beam, abaft the beam, on the bow, on the quarter, ahead, or astern. If the ship sails with a side-wind, it alters the names of such bearings in some measure, since a distant object on the beam is then said to be to leeward, or to windward; on the lee quarter, or bow; and on the weather quarter or bow.
Bearing-up, orBearing-away,arriver, in navigation, the act of changing the course of a ship, in order to make her run before the wind, after she had sailed some time with a side-wind, or close-hauled: it is generally performed to arrive at some port under the lee, or to avoid some imminent danger occasioned by a violent storm, leak, or enemy in sight.
This phrase, which is absurd enough, seems to have been derived from the motion of the helm, by which this effect is partly produced; as the helm is then borneupto the windward, or weather side of the ship. Otherwise, it is a direct contradiction in terms, to say that a shipbears up, when she goes before the wind; since the current of the wind, as well as that of a river, is always understood to determine the situation of objects or places within its limits. In the first sense we say, up to windward and down to leeward; as in the latter we say, up or down the river. This expression, however, although extremely improper, is commonly adopted in the general instructions of our navy, printed by authority, instead of bearing down, or bearing away.
BEATING, in navigation, the operation of making a progress at sea against the direction of the wind, in a zig-zag line, or traverse, like that in which we ascend a steep hill. As this method of sailing will be particularly explained under the termTacking, the reader is referred to that article.
ToBECALM,derober, (fromcalme, Dut.) to intercept the current of the wind, in its passage to a ship, with any contiguous object, as a shore above her sails, a high sea behind, or some other ship. At this time the sails remain in a state of rest, and are consequently deprived of their power to govern the motion of the ship.
BECKETS,bille, imply in general any thing used to confine loose ropes, tackles, oars, or spars, in a convenient place, where they may be disposed out of the way till they are wanted. Hence, beckets are either large hooks, or short pieces of rope, with a knot in one end and an eye in the other, or formed like a circular wreath; or they are wooden brackets; and, probably, from a corruption and misapplication of this last term, arose the word becket, which seems often to be confounded with bracket.
Put the tacks and sheets in theBeckets! the order to hang up the weather main and fore-sheet, and the lee main and fore-tack, to a little knot and eye-becket on the foremost main and fore-shrouds, when the ship is close-hauled, to prevent them from hanging in the water.
BED, a flat thick piece of timber, usually formed of the rough staves of casks, or such like materials, to be lodged under the quarters of casks containing any liquid, and stowed in a ship’s hold. The use of the beds is to support the cask, and keep the bilge, or middle-part of it, from bearing against the ship’s floor, or against the body upon which it rests, lest the staves should give way and break in the place where they are weakest: or lie in a wet place, so as to rot in the course of the voyage. See the articleStowing.
Bedof a river,lit., the bottom of the channel in which the stream or current usually flows.
Bedof a cannon. SeeCarriage.
ToBELAY,amarrer, (frombeleygen, Belg.) to fasten a rope, by winding it several times round a cleat, belaying-pin, or kevel: this term is peculiar to small ropes, and chiefly the running-rigging, there being several other expressions used for large ropes, as bitting, bending, making fast, stoppering, &c. See those articles.
BEND,avuste, (probably frombindan, Sax. to bind) the knot by which one rope is fastened to another, hence
ToBend, is to fasten one rope to another, of which there are several methods.
BENDINGthe cable, the operation of clinching, or tying the cable to the ring of its anchor.
Bendinga sail, fastening it to its yard or stay. See the articlesSail,Stay, andYard.
BENDS, the thickest and strongest planks in a ship’s side. SeeWales, by which name they are more properly called.
BETWEEN-DECKS,entre-pont, the space contained between any two decks of a ship.
BEVELLING, in ship-building, the art of hewing a timber with a proper and regular curve, according to a mould which is laid on one side of its surface.
‘In order to hew any piece of timber to its proper bevel, it will be necessary, first, to make one side fair, and out of winding; a term used to signify that the side of a timber should be a plane. If this side be uppermost, and placed horizontally, or upon a level, it is plain, if the timber is to be hewed square, it may be done by a plummet and line; but if the timber is not hewed square, the line will not touch both the upper and lower edge of the piece; or if a square be applied to it, there will be wood wanting either at the upper or lower side. This is called within or without a square. When the wood is deficient at the under-side, it is called under-bevelling; and when it is deficient in the upper-side, it is called standing-bevelling: and this deficiency will be more or less according to the depth of the piece; so that before the proper bevellings of the timbers are found, it will be sometimes very convenient to assign the breadth of the timbers; nay, in most cases it will be absolutely necessary, especially afore and abaft: though the breadth of two timbers, or the timber and room, which includes the two timbers and the space between them, may be taken without any sensible error, as far as the square body goes. For as one line represents the moulding-side of two timbers, the fore-side of the one being supposed to unite with the aft-side of the other; the two may be considered as one intire piece of timber.’Murray’s Ship-building.
BIGHT,balant, (bygan, Sax. to bend) the double part of a rope when it is folded, in contradistinction to the end: as, her anchor hooked thebightof our cable, i.e. caught any part of it between the ends. Thebightof his cable has swept our anchor; that is, the double part of the cable of another ship, as she ranged about, has entangled itself under the stock or fluke of our anchor.
Bight,anse, is also a small bay between two points of land.
BILANDER,bilandre, Fr. a small merchant-ship with two masts.
TheBilanderis particularly distinguished from other vessels of two masts by the form of her main-sail, which is a sort of trapezia, the yard thereof being hung obliquely on the mast in the plane of the ship’s length, and the aftmost or hinder end peeked or raised up to an angle of about 45 degrees, and hanging immediately over the stern; while the fore end slopes downward, and comes as far forward as the middle of the ship. To this the sail is bent or fastened; and the two lower corners, the foremost of which is called the tack, and the aftmost the sheet, are afterwards secured, the former to a ring-bolt in the middle of the ship’s length, and the latter to another in the taffarel. The main-sails of larger ships are hung across the deck instead of along it, being fastened to a yard which hangs at right angles with the mast and the keel.
Few vessels, however, are now rigged in this method, which has probably been found more inconvenient than several others. SeeShip. It may not be improper to remark, that this name, as well as brigantine, has been variously applied in different parts of Europe to vessels of different sorts.
BILGE, (supposed frombilik, Sax. a storm) that part of the floor of a ship, on either side of the keel, which approaches nearer to an horizontal than to a perpendicular direction, and on which the ship would rest if laid on the ground: or more particularly, those parts of the bottom which are opposite to the heads of the floor-timbers amidships on each side of the keel. Hence, when a ship receives a fracture in this place, she is said to bebilged.
BILLof lading,connoissement, an acknowledgment signed by the master of a ship, and given to a merchant, containing an account of the goods which the former has received from the latter, &c. with a promise to deliver them at the intended place for a certain sum of money. Each bill of lading must be treble; one for the merchant who ships the goods, another to be sent to the person to whom they are consigned, and the third to remain in the hands of the master of the said ship. It must, however, be observed, that a bill of lading is only used when the goods sent on board a ship are but part of the cargo; for when a merchant loads a vessel entirely on his own account, the deed passed between him and the master of the ship is called charter-party. SeeCharter-party.
BINACLE, a wooden case or box, which contains the compasses, log-glasses, watch-glasses, and lights to shew the compass at night.
As this is calledbittaclein all the old sea-books, even by mariners, it appears evidently to be derived from the French termhabitacle, (a small habitation) which is now used for the same purpose by the seamen of that nation.
TheBinacle(plateI. fig. 4.) is furnished with three apartments, with sliding shutters: the two side ones, a b, have always a compass in each, d, to direct the ship’s way, while the middle division, c, has a lamp or candle, with a pane of glass on either side to throw a light upon the compass in the night, whereby the man who steers may observe it in the darkest weather, as it stands immediately before the helm on the quarter-deck.
There are always two binacles on the deck of a ship of war, one being designed for the man who steers, and the other for the person who superintends the steerage, whose office is calledconning, orcunning.
BIRTH, orBerth,eviteé, the station in which a ship rides at anchor, either alone or in a fleet; or the distance between the ship and any adjacent object; comprehending the extent of the space in which she ranges at the length of her cables; as,she lies in a good birth, i. e. in a convenient situation, or at a proper distance from the shore and other vessels; and where there is good anchoring-ground, and shelter from the violence of the wind and sea.
Birth,appartement, also signifies the room or apartment where any particular number of the officers or ship’s company usually mess and reside. In a ship of war there is commonly one of these between every two guns.
ToBITE,mordre, to hold fast in the ground; expressed of the anchor.
BITS,bittes, (bitol, Sax.) a frame composed of two strong pieces of timber, fixed perpendicularly in the fore-part of a ship, whereon to fasten her cables as she rides at anchor. See b b,Piecesof theHull.
These pieces being let down through square mortises cut in the decks above and below, are bolted and fore-locked to the ship’s beams. There are several bits in a ship, the principal of which are those for the cables: their upper ends commonly reach about four or five feet above the lower deck, over which the cable passes. They are supported on the fore part by strong standards; one arm of which is bolted to the deck, and the other to the bits: and on the after part is fixed a strong beam of timber, g, (plateI.Piecesof theHull) parallel to the deck, and at right angles with the bits, to which it is bolted and forelocked. The ends of this beam, which is called the cross-piece, reach about two or three feet beyond the bits, whose upper-ends are nearly two feet above the cross-piece. The cable being passed once round about these bits, may be gradually slackened at pleasure; without which it would be impossible to prevent it from running out with the utmost rapidity, when the ship rides a great strain, which is always the case in a storm, or an impetuous tide. In ships of war there are usually two pair of cable bits, and when they are both used at once, the cable is said to be double-bitted. The plan of the bits, with their cross-pieces and standards, are represented in PlateIII. where b b are the bits, e their standards, and g the cross-piece.
ToBitthe cable, is to put it round the bits, in order to fasten it, or slacken it gradually, which last is calledveering away.
The other bits are of a smaller kind, but constructed nearly in the same manner. They are used to fasten the top-sail-sheets, or the ropes by which the lower corners of the top-sails are extended.
BLACK-STRAKES, a range of planks immediately above the wales in a ship’s side: they are always covered with a mixture of tar and lamp-black, forming an agreeable variety with the white bottom beneath, and the scraped planks of the side, covered with melted turpentine or varnish of pine, above. All the yards are likewise daubed with this mixture, which not only preserves them from the heat of the sun and the weather, but gives them a fine gloss, which makes a good appearance contrasted with the white varnish on the masts.
BLADE. See the articleOar.
BLOCK,poulie, a machine known in mechanics by the name of pully, and used for various purposes in a ship, particularly to increase the mechanical power of the ropes employed in contracting, dilating, or traversing the sails. The ends of these ropes, being arranged in certain places upon the deck, may thus be readily found whenever they are wanted. The blocks, which are for these purposes disposed in various places upon the masts, yards, and sails, and amongst the rigging, are also of various sizes, shapes, and powers, according to the effect they are calculated to produce. They are single, double, or treble, being so denominated from the number of wheels they contain. There are even some of five, six, and seven fold, but these are only employed to raise or move some very weighty bodies, and are not used about the yards or sails. We shall begin by describing the most simple, and afterwards proceed to those which are more complicated.
A common single block is composed of three parts; the shell, the sheave, and the pins. The shell,arcasse, approaches nearest to the figure of a long spheroid, somewhat flatted in the middle. Between the two flat sides it is hollowed so as to receive a narrow cylindrical wheel called the sheave,rouet, formed of lignum vitæ, or other hard wood; and thro’ the centre of this sheave is bored a round hole, to admit of a pin, which is driven through two corresponding holes in the middle of the shell, perpendicular to the hollow space within. The pin thus becomes the axis of the wheel or sheave, which completes the wooden work of the machine. Thus formed, it is bound with a sort of rope-ring, which is closely fitted to a notch passing round the surface of the shell, and over both ends of the pin: and by this ring, or wreath, which is called a block-strop, they are suspended upon the masts, shrouds, &c.
The complicated blocks, or those which contain a number of wheels, either have all the wheels to run upon one axis, (see plateI.) or have their shells so formed that the wheels are one above another. In the former shape they approach nearest the figure of a cylinder, and in the latter appear like two or more single blocks joined together endways.
In plateI. fig. 7. a, represents a single block, and b, c, two double ones, of different kinds, without strops. Fig. e, f, two double tackle-blocks iron bound, the lower one, f, being fitted with a swivel, g, a double iron-bound block with a large hook, h, a snatch-block, i, a top-block, k, a voyal-block, and l, a clue-garnet-block. SeeSnatch-Block,Tackle, andVoyal.
The Cat-block (plateII. fig. 15.) is employed to draw the anchor up the cat-head. See the articleCat.
The swivel in the iron-bound block is to turn it, that the several parts of the rope of which the tackle is composed may not be twisted round each other, which would greatly diminish the mechanical power.
The top-block is used to hoist up or lower down the top-masts, and is for this purpose hooked in an eye-bolt driven into the cap. SeeCap.
The clue-garnet blocks are used to draw the clues, or lower-corners of thecourses, up to the yard, and are consequently fastened to the clues of those sails. SeeClue-garnet. The use of the shoulder on the lower-end, is to prevent the strop from being fretted or chafed by the motion of the sail, as the ship rolls or pitches.
BOARD, in navigation, (bordée, Fr.) the space comprehended between any two places where the ship changes her course by tacking; or the line over which she runs between tack and tack, when she is turning to windward, or sailing against the direction of the wind. See the articlesBeatingandTacking.
She makes a goodBoard, i. e. sails nearly upon a streight line, without deviating to leeward when she is close-hauled. SeeClose-hauled.
BOARDING,abordage, an assault made by one ship upon another, by entering her in battle with a detachment of armed men; either because the efforts of the artillery and musquetry have proved ineffectual, or because she may have a greater number of men, and be better equipped for this attack than the enemy who defends herself against it.
This stratagem, however, is chiefly practised by privateers upon merchant-ships, who are not so well provided with men, and rarely attempted in the royal navy; the battle being generally decided in men of war by the vigorous execution of a close cannonade.
An officer should maturely consider the danger of boarding a ship of war before he attempts it; and be well assured that his adversary is weakly manned: for perhaps he wishes to be boarded, and if so, a great slaughter will necessarily follow.
The swell of the sea ought also to be considered, because it may run so high as to expose both the ships to the danger of sinking.
There is perhaps very little prudence in boarding a ship of equal force; and when it is attempted, it may be either to windward or to leeward, according to the comparative force or situation of the ships. If there be any swell, or sea, it may be more adviseable to lay the enemy aboard on the lee-side, as the water is there the smoothest; besides, if the boarder is repulsed in that situation, he may more easily withdraw his men, and stand off from his adversary. But as the weather-ship can generally fall to leeward at any time, it is perhaps more eligible to keep to windward, by which she will be enabled to rake her antagonist, or fire the broadside into her stern as she crosses it, in passing to leeward, which will do great execution amongst her men, by scouring the whole length of the deck.
Boarding may be performed in different places of the ship, according to the circumstances, preparation and position of both: the assailant having previously selected a number of men armed with pistols and cutlasses. A number of powder-flasks, or flasks charged with gun-powder and fitted with a fuse, are also provided, to be thrown upon the enemy’s deck immediately before the assault. Besides this, the boarder is generally furnished with an earthen shell, called a stink-pot, which on that occasion is suspended from his yard-arms or bow-sprit-end. This machine is also charged with powder, mixed with other inflammable and suffocating materials, with a lighted fuse at the aperture. Thus prepared for the action, and having grappled his adversary, the boarder displays his signal to begin the assault. The fuses of the stink-pot and powder-flasks being lighted, they are immediately thrown upon the deck of the enemy, where they burst and catch fire, producing an intolerable stench and smoke, and filling the deck with tumult and distraction. Amidst the confusion occasioned by this infernal apparatus, the detachment provided rush aboard sword in hand, under cover of the smoke, on their antagonist, who is in the same predicament with a citadel stormed by the besiegers, and generally overpowered, unless he is furnished with extraordinary means of defence, or equipped with close-quarters, to which he can retreat with some probability of safety. See the articleClose-Quarters.
BOAT (bæt, Sax.boot, Belg.) a small open vessel, conducted on the water by rowing or sailing. The construction, machinery, and even the names of boats, are very different, according to the various purposes for which they are calculated, and the services on which they are to be employed.
Thus they are occasionally slight or strong; sharp or flat-bottomed; open or decked; plain or ornamented; as they may be designed for swiftness or burthen; for deep or shallow water; for sailing in a harbour or at sea; and for convenience, or pleasure.
The largest boat that usually accompanies a ship is the long-boat,chaloupe, which is generally furnished with a mast and sails: those which are fitted for men of war, may be occasionally decked, armed, and equipped, for cruising short distances against merchant-ships of the enemy, or smugglers, or for impressing seamen, &c.
The barges are next in order, which are longer, slighter, and narrower: they are employed to carry the principal sea-officers, as admirals, and captains of ships of war, and are very unfit for sea. See the articleBarge.
Pinnaces exactly resemble barges, only that they are somewhat smaller, and never row more than eight oars; whereas a barge properly never rows less than ten. These are for the accommodation of the lieutenants, &c.
Cutters of a ship,bateaux, are broader, deeper, and shorter than the barges and pinnaces; they are fitter for sailing, and are commonly employed in carrying stores, provisions, passengers, &c. to and from the ship. In the structure of this sort of boats, the lower-edge of every plank in the side over-lays the upper-edge of the plank below, which is called by shipwrights clinch-work.
Yawls,canots, are something less than cutters, nearly of the same form, and used for similar services; they are generally rowed with six oars.
The above boats more particularly belong to men of war; as merchant-ships seldom have more than two, viz. a long-boat and yawl: when they have a third, it is generally calculated for the countries to which they trade, and varies in its construction accordingly.
Merchant-ships employed in the Mediterranean find it more convenient to use a lanch, which is longer, more flat-bottomed, and better adapted every way to the harbours of that sea than a long-boat. SeeLanch.
A wherry,diligence, is a light sharp boat, used in a river or harbour for carrying passengers from place to place.
Punts,flette, are a sort of oblong flat-bottomed boats, nearly resembling floating stages; they are used by shipwrights and caulkers, for breaming, caulking, or repairing a ship’s bottom.
A moses is a very flat broad boat, used by merchant-ships amongst the Caribbee-islands, to bring hogsheads of sugar off from the sea-beach to the shipping which are anchored in the roads.
A felucca is a strong passage-boat used in the Mediterranean, from ten to sixteen banks of oars. The natives of Barbary often employ boats of this sort as cruisers.
For the larger sort of boats, see the articlesCraft,Cutter,Periagua, andShallop.
Of all the small boats, a Norway yawl seems to be the best calculated for a high sea, as it will often venture out to a great distance from the coast of that country, when a stout ship can hardly carry any sail.
Trim theBoat!barque-droit!the order to sit in the boat in such a manner as that she shall float upright in the water, without leaning to either side.
To bale theBoat, is to throw out the water which remains in her bottom or the well-room.
Moor theBoat! the order to fasten a boat with two ropes, so as that the one shall counter-act the other.
For a representation of some of the principal boats of a ship of war, see plateIII. where fig. 1. exhibits the elevation, or side view, of a ten-oared barge; a a, its keel; b, the stern-post; c, the stem; b c, the water-line, which separates what is under the surface of the water from what is above it; e, the row-locks, which contain the oars between them; f, the top of the stern; g, the back-board; f g, the place where the cockswain stands or sits while steering the boat; l, the rudder, and m, the tiller, which is of framed iron.
Fig. 2. represents the plan of the same barge, where d is the ‘thwarts, or seats where the rowers sit to manage their oars; f, i, h, the stern-sheets; i k, the benches whereon the passengers sit in the stern-sheets: the rest is explained in fig. 1.
Fig 3. is a stern view of the same barge, with the projection of all the timbers in the after-body; and fig. 4, a head view, with the curves of all the timbers in the fore-body.
Having thus explained the different views of the barge, the reader will easily comprehend the several corresponding parts in the other boats; where fig. 5 is the plan, and fig. 6 the elevation of a twelve-oared cutter that rows double banked: which, although seldom employed unless in capital ships, because requiring twelve rowers, is nevertheless a very excellent boat, both for rowing and sailing. Fig. 7 and 8 are the head and stern of this boat.
Fig. 9 is the plan of a long-boat, of which fig. 10 is the elevation, 11 the stern-view, and 12 the head-view.
Boat-hook, an iron hook with a sharp point on the hinder part thereof, to stick into a piece of wood, a ship’s-side, &c. It is stuck upon a long pole or shaft, (pl. III. fig. 1 n.) by the help of which a person in the boat may either hook any thing to confine the boat in a particular place, or push her off by the sharp point attached to the back of the hook.
Boatswain,Contre-maitre, the officer who has the boats, sails, rigging, colours, anchors, and cables committed to his charge.
It is the duty of the boatswain particularly to direct whatever relates to the rigging of a ship, after she is equipped from a royal dock-yard. Thus he is to observe that the masts are properly supported by their shrouds, stays, and back-stays, so that each of those ropes may sustain a proportional effort when the mast is strained by the violence of the wind, or the agitation of the ship. He ought also to take care that the blocks and running-ropes are regularly placed, so as to answer the purposes for which they are intended; and that the sails are properly fitted to their yards and stays, and well furled or reefed when occasion requires.
It is likewise his office to summon the crew to their duty; to assist with his mates in the necessary business of the ship; and to relieve the watch when it expires. He ought frequently to examine the condition of the masts, sails, and rigging, and remove whatever may be judged unfit for service, or supply what is deficient: and he is ordered by his instructions to perform this dutywith as little noise as possible.
BOB-STAY,sous-barbe, a rope used to confine the bowsprit of a ship downward to the stem, or cut-water. It is fixed by thrusting one of its ends through a hole bored in the fore-part of the cut-water for this purpose, and then splicing both ends together so as to make it two-fold, or like the link of a chain: adead-eyeis then seized into it, and alaniardpassing through this and communicating with another dead-eye upon the bowsprit, is drawn extremely tight by the help of mechanical powers. SeeBowsprit.
The use of the bob-stay, is to draw down the bowsprit, and keep it steddy; and to counter-act the force of the stays of the fore-mast, which draw it upwards. The bowsprit is also fortified by shrouds from the bows on each side; which are all very necessary, as the foremast and the upper-part of the main-mast are stayed and greatly supported by the bowsprit. For this reason, the bob-stay is the first part of a ship’s rigging which is drawn tight to support the masts. To perform this task more effectually, it is usual to suspend a boat, anchor, or other weighty body, at the bowsprit-end, to press it downwards during this operation.
BOLSTERS, a sort of small cushions or bags, filled with tarred canvas, laid between the collars of the stays and the edge of some piece of wood on which they lie: they are used to preserve the stays from being chafed or galled by the motion of the masts, as the ship rocks or pitches at sea.
BOLT-ROPE,ralingue, a rope to which the edges or skirts of the sails are sewed, to strengthen, and prevent them from rending. Those parts of the bolt-rope which are on the perpendicular or sloping edges, are called leech-ropes; that at the bottom, the foot-rope; and that on the top or upper edge, the head-rope. Stay-sails, whose heads are formed like an acute angle, have no head-rope. To different parts of the bolt-rope are fastened all the ropes employed to contract or dilate the sails. The figure and position of the bolt-rope is exhibited in the plate referred to from the articleSail.
BOMB. See the articlesMortarandShell.
BOMB-VESSEL, a small ship particularly calculated to throw bombs into a fortress. They are said to be invented by M. Reyneau, and to have been first put in action at the bombardment of Algiers. Till then it had been judged impracticable to bombard a place from the sea. See a particular description of these ships in the articleKetch.
BOOM,estacade,barre, (fromboom, a tree, Dutch) in marine fortification, a strong chain or cable, on which are fastened a number of poles, bars, &c. extending athwart the mouth of a harbour or river, to prevent the enemies ships of war from entering. It may be occasionally sunk, or drawn up to the surface of the water, by capsterns, and other mechanical powers.
Booms,boute dehors, certain long poles run out from different places in the ship to extend the bottoms of particular sails. Of these there are several sorts; as the jib-boom, studding-sail-booms, ring-tail-boom, driver-boom, main-boom, and square-sail-boom; the two last, however, are only appropriated to small ships of one or two masts. SeeJib, &c.
BOOT-TOPPING, the act of cleaning the upper-part of a ship’s bottom, or that part which lies immediately under the surface of the water, and daubing it over with tallow, or with acoator mixture of tallow, sulphur, resin, &c.
Boot-toppingis chiefly performed where there is no dock, or other commodious situation for breaming or careening; or when the hurry of a voyage renders it inconvenient to have the whole bottom properly trimmed and cleansed of the filth which gathers to it in the course of a sea-voyage. It is executed by making the ship lean to one side, as much as they can with safety, and then scraping off the grass, slime, shells, or other material, that adheres to the bottom, on the other side, which is elevated above the surface of the water for this purpose, and accordingly daubed with the coat of tallow and sulphur. Having thus finished one side, they make the ship lean to the other side, and perform the same operation, which not only preserves the bottom from the worm, but makes the ship slide smoothly through the water. SeeCareenandDock.