ANUNIVERSAL DICTIONARYOF THEMARINE.
ABACK,coeffé, the situation of the sails when their surfaces are flatted against the masts by the force of the wind.
The sails are said to betaken aback, when they are brought into this situation, either by a sudden change of the wind, or by an alteration in the ship’s course. They arelaid aback, to effect an immediate retreat, without turning to the right or left; or, in the sea-phrase, to give the shipstern-way, in order to avoid some danger discovered before her in a narrow channel; or when she has advanced beyond her station in the line of battle, or otherwise.
The sails are placed in this position by slackening their lee-braces, and hauling in the weather ones; so that the whole effort of the wind is exerted on the fore-part of their surface, which readily pushes the ship astern, unless she is restrained by some counter-acting force. SeeBacking, andBracing.
It is also usual to spread some sail aback near the stern, as the mizen-top-sail, when a ship rides with a single anchor in a road, in order to prevent her from approaching it so as to entangle the flukes of it with her slackened cable, and thereby loosen it from the ground. SeeAnchor.
Fig. 1. PlateIII. discovers the plan of a ship,a b, with her main-top-sail,c d, aback; in which the curved dotted line expresses the cavity of it, as blown back by the wind on each side of the mast. The fore-top-sail, which is full, is exhibited by the linee f. Fig. 3. represents a perspective view of the ship in the same situation; and the dart shews the direction of the wind upon both.
Lay all flatAback, the order to arrange all the sails in this situation.
ABAFT,arriere, (abaftan, Sax. behind) the hinder part of a ship, or all those parts both within and without, which lie towards the stern, in opposition to afore; which see.
Abaft,arriere de, is also used as a preposition, and signifiesfurther aft, ornearer the stern; as, the barricade standsabaftthe main mast, i. e. behind it, or nearer the stern.
ABOARD (à bord, Fr.abordo, Ital.) the inside of a ship: hence any person who enters a ship is said to goaboard: but when an enemy enters in the time of battle, he is said toboard. A phrase which always implies hostility. See the articleBoarding.
To fallAboardof,aborder, to strike or encounter another ship, when, one or both are in motion; to be driven upon a ship by the force of the wind or current.
Aboard-main-tack!amure la grande voile!the order to draw the main-tack, i. e. the lower corner of the main-sail, down to the chess-tree. SeeChess-tree.
ABOUT,reviré, (abutan, Sax.) the situation of a ship immediately after she hastackedor changed her course by going about, and standing on the other tack. SeeTacking.
About-Ship!adieu-va!the order to the ship’s crew to prepare for tacking.
ABREAST,par le travers(ofbreost, Sax.), side by side, or opposite to; a situation in which two or more ships lie, with their sides parallel to each other, and their heads equally advanced.
This term more particularly regards the line of battle at sea, where, on the different occasions of attack, retreat, or pursuit, the several squadrons, or divisions of a fleet, are obliged to vary their dispositions, and yet maintain a proper regularity by sailing inrightorcurvedlines. When the line is formedabreast, the whole squadron advances uniformly, the ships being equally distant from, and parallel to each other, so that the length of each ship forms a right angle with the extent of the squadron or lineabreast. The commander in chief is always stationed in the center, and the second and third in command in the centers of their respective squadrons. See this farther illustrated in the articleLine.
Abreast, within the ship, implies on a line with the beam, or by the side of any object aboard; as, the frigate sprung a leak abreast of the main hatch-way, i. e. on the same line with the main hatch-way, crossing the ship’s length at right angles, in opposition toaforeorabaftthe hatch-way. SeeAbaft.
We discovered a fleetAbreastof Beachy-Head, i. e. off, or directly opposite thereto.
ACORN,pomme de girouette, a little ornamental piece of wood, fashioned like a cone, and fixed on the uppermost point of the spindle, above the vane, on the mast-head. It is used to keep the vane from being blown off from the spindle in a whirlwind, or when the ship leans much to one side under sail. See plateI. fig. 1. wherearepresents the acorn,bthe vane and stock,cthe spindle, anddthe mast-head.
ADMIRAL,amiral, an officer of the first rank and command in the fleet, and who is distinguished by a flag displayed at his main-top-mast-head. Also an officer who superintends the naval forces of a nation, and who is authorised to determine in all maritime causes.
The origin and denomination of this important office, which seems to have been established in most countries that border on the sea, have given rise to a great variety of opinions. Some have borrowed them from the Greek, others from the Arabic, while a third sort, with greater probability, derive both the title and dignity from the Saracens.[1]But since no certain conclusions have been deduced from these elaborate researches, and as it rather appears the province of this work to give the reader an idea of the office and duty of an admiral at sea, than to furnish an historical or chronological detail of the rank and power with which admirals have been invested in different nations, we shall contentedly resign this task to the ingenious lexicographers who have so repeatedly entertained us with such critical investigations.
TheAdmiral, or commander in chief of a fleet, being frequently invested with a great charge, on which the fate of a kingdom may depend, ought certainly to be possessed of abilities equal to so important a station and so extensive a command. His fleet is unavoidably exposed to a variety of perplexing situations in a precarious element. A train of dangerous incidents necessarily arise from those situations. The health, order, and discipline of his people, are not less the objects of his consideration, than the condition and qualities of his ships. A sudden change of climate, a rank and infectious air, a scarcity, or unwholsomness of provisions, may be as pernicious to the former, as tempestuous weather or dangerous navigation to the latter. A lee-shore, an injudicious engagement with an enemy greatly superior, may be equally fatal to both. He ought to have sufficient experience to anticipate all the probable events that may happen to his fleet during an expedition or cruise, and, by consequence, to provide against them. His skill should be able to counter-act the various disasters which his fleet may suffer from different causes. His vigilance and presence of mind are necessary to seize every favourable opportunity that his situation may offer to prosecute his principal design; to extricate himself from any difficulty or distress; to check unfortunate events in the beginning, and retard the progress of any great calamity. He should be endued with resolution and fortitude to animate his officers by the force of example, and promote a sense of emulation in those who are under his command, as well to improve any advantage, as to frustrate or defeat the efforts of his ill fortune.
The most essential part of his duty, however, appears to be military conduct. As soon as the fleet under his command puts to sea, he is to form it into the proper order of battle, called theLine. In this arrangement he is to make a judicious distribution of strength from the van to the rear, throwing the principal force into the center, to resist the impression of the enemy’s fleet; which might otherwise, at some favourable opportunity, break through his line, and throw the van and rear into confusion.
A competent knowledge of the seas, weather, and reigning winds, of the coast or region where he is stationed, is also requisite, as it will greatly facilitate his plans on the enemy. It will enable him to avoid being improperly embayed, where he might be surprised in a disadvantageous situation; and to judge whether it will be most expedient to attack his adversary, or lie prepared to receive his assault. When his fleet is forced by stress of weather or otherwise to take shelter in a road or bay, it will likewise suggest the necessary conduct of keeping a sufficient number of cruisers at sea, to bring him early intelligence, that they may be ready to cut or slip the cables when they are too much hurried to weigh their anchors.
As the forming a complete, strong, and uniform line is a very material article in naval war, the admiral ought frequently to arrange the fleet under his command into this order, that the inferior officers may observe to bring their ships, with greater dexterity and alertness, into their several stations, and maintain the regularity of the line when they tack, veer, or sail abreast. SeeLine.
When the admiral intends a descent on an enemy’s coast, or other attack which may be attended with complicated and unforeseen incidents, his orders should be delivered or drawn up with the greatest accuracy and precision: they should be simple, perspicuous, direct, and comprehensive; they should collect a number of objects into one point of view, and, foreseeing the effects of success or defeat, appoint the proper measures to be adopted in consequence thereof. History and experience confirm the necessity of this observation, and present us with a variety of disasters that have happened on such occasions, merely by a deficiency in this material article. In the commanding officer, inattention, barrenness of expedient, or a circumscribed view of the necessary effects of his enterprize, may be equally pernicious. And general orders ought to be utterly free from pedantry and perplexity, which always betray a false taste and confused imagination, besides the probability of producing many fatal consequences.
When an admiral conquers in battle, he should endeavour to improve his victory, by pushing the advantages he has acquired as far as prudence directs; a conduct which merits his attention as much as any in the action! When he is defeated, he ought to embrace every opportunity of saving as many of his ships as possible, and endeavour principally to assist those which are disabled. In short, it is his duty to avail himself of every practicable expedient rather than sink under his misfortune, and suffer himself to become an easy prey to the enemy.
He should be sufficiently acquainted with civil law, to judge with propriety of the proceedings of courts-martial, and to correct the errors, and restrain the abuses which may happen therein by mistake, or ignorance, or inattention.
As secret treaties, propositions, or schemes of the enemy, may occasionally be submitted to his inspection, or fall into his possession by capture; and which it might be improper to discover to any person near him, he ought to have a competent knowledge of the modern languages, or at least, those of the countries against whom his military operations are directed, to be able to comprehend with facility the full scope and purport of such papers.
He ought to be well versed in geometry, to order proper and correct surveys of unknown coasts, roads, or harbours to be made, and to judge of their accuracy, and detect their errors. To ascertain the situation and longitude of different places, he should be also sufficiently skilled in astronomy, and the method of taking observations, which indeed is essentially necessary to the profession of a sea-officer, although too much neglected.
By his orders the admiral is likewise to assist at all councils of war that relate to naval affairs: to visit, as often as convenient, the other ships of his squadron: to enquire particularly into their condition, and observe the men mustered, taking care that no supernumeraries are borne on the books. He is directed to acquaint the secretary of the admiralty of all his proceedings relating to the service, for the information of the lord-high-admiral, or lords commissioners of the admiralty; and to attend him or them, on his return home, with an account of his voyage or expedition, and to transmit a copy of his journal to their secretary.
Much more might be observed on this occasion. It appears however by the general outline which we have sketched, that the office and duty of an admiral requires greater skill and more comprehensive abilities than is generally supposed necessary to the command of a naval armament. And that he ought to be duly qualified, at least in this kingdom, to assist at the councils of his sovereign, and enter into the enlarged system of protecting his country from an invasion by sea, or of meditating a descent on an enemy’s coast; as well as to improve navigation, and open new channels of commerce. For further particulars of his charge, see the articlesEngagement,Line,Squadron.
Admiralof the fleet, the highest officer under the admiralty of Great-Britain: when he embarks on any expedition, he is distinguished by the union flag at the main-top-mast-head.
Vice-Admiral,vice-Amiral, the officer next in rank and command to admiral; his flag is displayed at the fore-top-mast-head.
Rear-Admiral,contre-amiral,lieutenant-général des armées navales, the officer next in rank and command to the vice-admiral, and who carries his flag at the mizen-top-mast-head.
There are at present in England, besides the admiral of the fleet, three admirals of the white squadron, and four of the blue. Three vice-admirals of the red, three of the white, and four of the blue. Four rear-admirals of the red, four of the white, and five of the blue squadron: besides twenty-two rear-admirals that have carried no flag, who are superannuated upon half-pay.
Vice-Admiralis also a civil officer appointed by the lords-commissioners of the admiralty. There are several of these officers established in different parts of Great-Britain, with judges and marshals under them, for executing jurisdiction within their respective districts. Their decisions, however, are not final, an appeal lying to the court of admiralty in London.
ADMIRALTY,Amirauté, the office of lord-high-admiral, whether discharged by one single person, or by joint commissioners, called Lords of the Admiralty.
ADVICE-BOAT,pacquet d’ avis, a small vessel employed to carry expresses or orders with all possible dispatch.
ADRIFT (fromaanddrift, Sax.) the state of a ship or vessel broke loose from her moorings, and driven without controul at the mercy of the wind, seas, or current, or all of them together.
AFLOAT, (à flot, Fr.) floating on the surface of the water: a ship is said to beafloatwhen there is a volume of water under her bottom of sufficient depth to buoy her up from the ground.
AFORE,avant, (fore, Sax.) all that part of a ship which lies forward, or near the stem.
Afore, as a preposition, likewise impliesfurther forward, or nearer the prow; as, the manger standsaforethe fore-mast, i. e. further forward, or nearer the stem. In both these sensesaforeis used in contradistinction toabaft. See the articleAbaft.
AFT,arriere, (fromæfter, orabaft) behind, or near the stern of the ship; being opposed tofore; as, run out the gunsfore and aft! i. e. from one end of the ship to the other; and whence,
AFTER,de l’arriere, (æfter, Sax.) a phrase applied to any object situated in the hinder-part of the ship; as, theafter-hatchway, theafter-capstern, theafter-sails, &c.
TheAfter-Sailsusually comprehend all those which are extended on the mizen-mast, and on the stays between the mizen and main-masts. They are opposed to the head-sails, which include all those that are spread on the fore-mast and bowsprit; and both by their mutual operation on the opposite ends of the ship, duly balance her when under sail. See the articleTrim.
AGENT-Victualler,avitalleur, an officer stationed at a royal port, to regulate the victualling of the king’s ships, under the directions of the commissioners for victualling the navy. He receives all the provisions from the victualling-office in London, and distributes them to the ships in the harbour. He also receives into his store-houses such as may be returned by ships after the expiration of their voyage, and renders an account thereof to the said commissioners.
AGROUND,echoué, (fromaandground) the situation of a ship whose bottom, or any part of it, hangs or rests upon the ground, so as to render her immoveable till a greater quantity of water floats her off; or till she is drawn out into the stream, by the application of mechanical powers.
AHEAD,avant,au devant, (fromaandhead, Sax.) further onward than the ship, or at any distance before her, lying immediately on that point of the compass to which her stem is directed. It is used in opposition toastern, which expresses the situation of any object behind the ship. SeeAstern.
To runAheadof one’s reckoning,depasser, to sail beyond the place shewn erroneously in the dead-reckoning as the ship’s station.
LineAhead. See the articleLine.
A-HULL,à sec; à mats, & à cordes(fromaandhull) the situation of a ship when all her sails are furled on account of the violence of the storm, and when having lashed her helm on the lee-side, she lies nearly with her side to the wind and sea, her head being somewhat inclined to the direction of the wind. See this further explained in the articleTrying.
AIM, the direction of a cannon, or other fire-arm, to its object, or the point to which it is directed; whence,
To takeAim,prendre sa mire, (fromesmer, Fr.) is to point a gun to its object according to the point-blank range. SeeCannonandRange.
ALEE,envoié, (fromaandlee) the situation of the helm when it is pushed down to the lee side of the ship, in order to put the ship about, or lay her head to the windward.
ALLin the wind, the state of a ship’s sails when they are parallel to the direction of the wind, so as to shake and shiver, by turning the ship’s head to windward, either by design, or neglect of the helm’s man.
All’s well! an acclamation of safety or security pronounced by a centinel, and repeated by all the others who are stationed in different places of a ship of war, at the time of striking the bell each half-hour during the period of the night watch.
Allhands high, orAllhands hoay!tout le monde haut!the call or order by which all the ship’s company are summoned upon deck by the boatswain.
ALOFT,en haut, (loffter, to lift up, Dan.) up in the tops, at the mast-heads, or any where about the higher yards or rigging.
ALONG-side,bord à bord,flanc & flanc, side by side, or joined to a ship, wharf, &c. and lying parallel thereto.
To layAlong-side,alonger, to arrange a ship by the side of another.
Along-shore, along the coast; this phrase is commonly applied to coasting-navigation, or to a course which is in sight of, and nearly parallel to, the shore.
LyingAlong,à la bande, (au longe, Fr.) the state of being pressed down sideways by a weight of sail in a fresh wind that crosses the ship’s course either directly or obliquely.
ALOOF,lof, this has frequently been mentioned as a sea-term, but whether justly or not we shall not presume to determine; it is known in common discourse to imply, at a distance; and the resemblance of the phrases,keep aloof, andkeep a luff, orkeep the luff, in all probability gave rise to this conjecture. If it was really a sea-phrase originally, it seems to have referred to the dangers of a lee-shore, in which situation the pilot might naturally apply it in the sense commonly understood,viz.keepall off, or quite off: it is, however, never expressed in that manner by seamen now. SeeLuff. It may not be improper to observe, that, besides using this phrase in the same sense with us, the French also call the weather side of a ship, and the weather clue of a course,le lof.
AMAIN,cale-tout, (frommain, ormaigne, old French) at once, suddenly; as, let goamain! i. e. let it run at once. This phrase is generally applied to any thing that is hoisted or lowered by a tackle, or complication of pullies.
AMIDSHIPS, the middle of the ship, either with regard to her length or breadth. Example in the first sense; The enemy boarded usamidships, i. e. in the middle, between the stem and stern. Example in the second sense; Put the helmamidships, i. e. in the middle, between the two sides.
ANCHOR,ancre(anchora, Lat. fromαγκυρα, Greek) a heavy, strong, crooked instrument of iron, dropped from a ship into the bottom of the water, to retain her in a convenient station in a harbour, road, or river.
The most ancient anchors are said to have been of stone, and sometimes of wood, to which a great quantity of lead was usually fixed. In some places baskets full of stones, and sacks filled with sand, were employed for the same use. All these were let down by cords into the sea, and by their weight stayed the course of the ship. Afterwards they were composed of iron, and furnished with teeth, which being fastened to the bottom of the sea, preserved the vessel immoveable; whenceὀδοντεςanddentesare frequently taken for anchors in the Greek and Latin poets. At first there was only one tooth, whence anchors were calledἐτερόστομοι; but in a short time the second was added by Eupalamus, or Anacharsis, the Scythian philosopher. The anchors with two teeth were calledἀμφίβολοι, orἀμφίστομοι, and from ancient monuments appear to have been much the same with those used in our days, only the transverse piece of wood upon their handles (the stock) is wanting in all of them. Every ship had several anchors, one of which, surpassing all the rest in bigness and strength, was peculiarly termedἱηρὰ, orsacra, and was never used but in extreme danger; whencesacram anchoram solvere, is proverbially applied to such as are forced to their last refuge.Potter’s Antiquities of Greece.
The anchors now made are contrived so as to sink into the ground as soon as they reach it, and to hold a great strain before they can be loosened or dislodged from their station. They are composed of a shank, a stock, a ring, and two arms with their flukes. The stock, which is a long piece of timber fixed across the shank, serves to guide the flukes in a direction perpendicular to the surface of the ground; so that one of them sinks into it by its own weight as soon as it falls, and is still preserved steadily in that position by the stock, which, together with the shank, lies flat on the bottom. In this situation it must necessarily sustain a great effort before it can be dragged through the earth horizontally. Indeed this can only be effected by the violence of the wind or tide, or of both of them, sometimes increased by the turbulence of the sea, and acting upon the ship so as to stretch the cable to its utmost tension, which accordingly may dislodge the anchor from its bed, especially if the ground be soft and oozy or rocky. When the anchor is thus displaced, it is said, in the sea phrase, tocome home.
That the figure of this useful instrument may be more clearly understood, let us suppose a long massy beam of iron erected perpendicularly, PlateI. fig. 2.b c; at the lower end of which are two arms,de, of equal thickness with the beam (usually called the shank) only that they taper towards the points, which are elevated above the horizontal plane at an angle of thirty degrees; or inclined to the shank at an angle of sixty degrees: on the upper part of each arm (in this position) is a fluke, or thick plate of iron,g h, commonly shaped like an isosceles triangle, whose base reaches inwards to the middle of the arm. On the upper-end of the shank is fixed the stock transversely with the flukes: the stock is a long beam of oak,f, in two parts, strongly bolted, and hooped together with iron rings. See also fig. 3. Close above the stock is the ring,a, to which the cable is fastened, orbent: the ring is curiously covered with a number of pieces of short rope, which are twisted about it so as to form a very thick texture or covering, called the puddening, and used to preserve the cable from being fretted or chafed by the iron.
Every ship has, or ought to have, three principal anchors, with a cable to each, viz. the sheet,maitresse-ancre, (which is theanchora sacraof the antients) the best bower,second ancre, and small bower,ancre d’ affourche, so called from their usual situation on the ship’s bows. There are besides smaller anchors, for removing a ship from place to place in a harbour or river, where there may not be room or wind for sailing; these are the stream-anchor,ancre de touei; the kedge and grappling,grapin; this last, however, is chiefly designed for boats.
To drag theAnchors,chasser sur ses ancres, implies the effort of making the anchorcome home, when the violence of the wind, &c. strains the cable so as to tear it up from the bed into which it had sunk, and drag it along the ground; as already explained.
Foul-Anchor: it is so called when it either hooks some other anchor, wreck, or cable, under the surface of the water; or when, by the wind suddenly abating, the ship slackens her strain, and straying round the bed of her anchor, entangles her slack cable about the upper fluke of it, and easily draws it out of its place, as soon as she begins to ride with a strain. To prevent this, it is usual, as she approaches the anchor, in light winds, to draw the slack cable into the ship as fast as possible.
ToAnchor,ancrer,mouiller,&c.is to let go the anchor, and to let the ship ride thereby.
TheAnchoris a cock-bill,ancre est àla vielle, implies that the shank-painter, or rope by which the flukes were hung to the ship’s bow, being cast off, the flukes drop down perpendicularly; whilst the anchor is suspended at the cat-head by its stopper, ready to be sunk from the bow at a moment’s warning.
AtAnchor,à l’ ancre, the situation of a ship which rides by her anchor in a road or haven, &c. PlateI. fig. 6. represents the fore-part of a ship, as riding in this situation.
TheAnchoris a peek. See the articleApeek.
TheAnchoris a-trip, ora-weigh. See those articles.
To back theAnchor. SeeBack.
To cat theAnchor,caponner l’ancre, is to hook a tackle called thecatto its ring, and thereby pull it up close to the cat-head, which see.
To fish theAnchor, to draw up the flukes upon the ship’s side after it is catted. See the articlesDavitandFish.
To sheer the ship to herAnchor,gouverner sur l’ancre, is to steer the ship’s head towards the place where the anchor lies when they are heaving the cable into the ship; that the cable may thereby enter the hause with less resistance, and the ship advance towards the anchor with greater facility.
To shoe theAnchor. See the articleShoe.
To weigh theAnchor,lever l’ancre, to heave the anchor out of the ground by its cable. SeeCapsternandWindlass.
To weigh theAnchorwith the long-boat,lever l’ancre avec la chaloupe, is to draw it up by applying mechanical powers to the buoy-rope, and thereby pull it up to the boat’s stem or stern.
To weigh theAnchorby the hair, is to weigh it by the cable in a boat, when the ship cannot approach it, or when the buoy rope is broke. See the French termAncre, and the phrases which succeed in order.
Anchor-ground,fond de bonne tenue, is a bottom which is neither too deep, too shallow, nor rocky; as in the first the cable bears too nearly perpendicular, and is thereby apt to jerk the anchor out of the ground: in the second, the ship’s bottom is apt to strike at low water, or when the sea runs high, by which she is exposed to the danger of sinking: and in the third, the anchor is liable to hook the broken and pointed ends of rocks, and tear away its flukes; whilst the cable, from the same cause, is constantly in danger of being cut through as it rubs on their edges.
APEEK, (à pique, Fr.) perpendicular to the anchor; a ship is said to be in this situation, when the cable is drawn so tight into the bow as to, bring her directly over the anchor, so that the cable bears right down from the ship’s stem.
APRON, (fromaandforan, Sax.) a platform, or flooring of plank, raised at the entrance of a dock, a little higher than the bottom, against which the dock gates are shut. See the articleDock.
Apron,contre etrave, in ship-building, a piece of curved timber fixed behind the lower part of the stem, immediately above the foremost end of the keel. See plateI. fig. H. in thePiecesof theHull.
TheApronconforms exactly to the shape of the stem, so that when the convexity of the former is applied to the concavity of the latter, it forms one solid piece, which serves to fortify the stem, and give it a firmer connexion with the keel.
As the apron is composed of two pieces scarfed together, and used to support she scarf of the stem, it is necessary that the scarf thereof should be at some distance from that of the stem. It is formed of the same thickness with the heel of the stem; but its thickness is equal throughout. Sometimes the piece immediately under the apron forms a curve, of which the horizontal part covers the dead-wood, whilst the vertical part corresponds with the inside of the stem, to which it is fayed, making the commencement of the apron.
Naval ARCHITECTUREPlate. i.
Naval ARCHITECTUREPlate. i.
Naval ARCHITECTUREPlate. i.
Apron,platine, is also a square piece of lead fastened over the touch-hole of the cannon, to keep the charge dry at sea or in rainy weather.
NavalARCHITECTURE, or the science of ship-building, comprehends the theory of delineating marine vessels upon a plane; and the art of framing them upon the stocks, according to the proportions exhibited in a regular design.
All edifices, whether civil or military, are known to be erected in consequence of certain established plans, which have been previously altered or improved till they have arrived at the desired point of perfection. The construction of ships appears also to require at least as much correctness and precision as the buildings which are founded uponterra firma: it is therefore absolutely necessary that the mechanical skill of the shipwright should be assisted by plans and sections, which have been drawn with all possible exactness, examined by proper calculations, and submitted to the most accurate scrutiny.
NavalArchitecture, or ship-building, may be distinguished into three principal parts.
First, To give the ship such an exterior form as may be most suitable to the service for which she is designed.
Secondly, to give the various pieces of a ship their proper figures; to assemble and unite them into a firm, compact frame, so that by their combination and disposition they may form a solid fabric, sufficient to answer all the purposes for which it is intended: And,
Thirdly, To provide convenient accommodations for the officers and crew, as well as suitable apartments for the cargo, furniture, provisions, artillery and ammunition.
The exterior figure of a ship may be divided into the bottom and upper-works.
The bottom, or quick-work, contains what is termed thehold, and which is under water when the ship is laden. The upper-works, called also the dead-work, comprehend all that part which is usually above the water when the ship is laden.
The figure of the bottom is therefore determined by the qualities which are necessary for the vessel, and conformable to the service for which she is proposed.
The limits of our design will not admit of a minute description, and enumeration of all the pieces of timber which enter into the construction of a ship, nor of a particular description of their assemblage and union; or the manner in which they reciprocally contribute to the solidity of those floating citadels. It nevertheless appears necessary to give a general idea of the use, figure, and station, of the principal pieces, to those who are intirely unacquainted with the subject. As our definitions will be greatly illustrated also by the proper figures, we have annexed to this article a plate which comprehends some of the most material draughts, as well as a representation of the principal pieces employed in naval architecture.
It is usual amongst shipwrights to delineate three several draughts.
First, The whole length of the ship is represented according to a side view, perpendicular to the keel, and is termed the plane of elevation, or sheer-draught. PlateI.
Second, The ship is exhibited according to an end view, and stripped of her planks, so as to present the outlines of the principal timbers; and this is properly termed the plane of projection, or the vertical plane of the timbers, PlateI. because it shews the projection of their frames relatively to each other.
Third, It is not sufficient to have the vertical curves of the bottom in different places, for a distinct idea of the horizontal curves is also equally necessary and useful: this is obtained by means ofwater-lines, traced upon what is called the horizontal plane. In this draught, the curves of the transoms called theround-aft, is also marked, and sometimes the breadth and thickness of the timbers.
The plane of elevation, plateI. determines the length and depth of the keel; the difference of the draughts of water; the length and projection, orrake, of the stem and stern-post; the position of the mid-ship frame upon the keel, together with that of the principal frames afore and abaft; the load-water-line; the wales, the dimensions and situations of the gun-ports, the projection of the rails of the head and stern-gallery, with the stations of the masts and channels. See the articleElevation.
This draught, however, conveys no idea of the vertical curve of the ribs or timbers; for as their projection will be only represented in a plane elevated upon the length of the keel, they will appear in this direction no otherwise than as streight lines. To perceive these curves accurately, they must be regarded in another point of view, which will represent their projection upon a vertical plane, supposed to cut the keel at right angles in the place where the ship is broadest. For as all ships are broader near the middle of their length than towards the extremities, it is evident that the timbers are more extended in proportion. The most capacious of these represents what is called themidship-frame; and upon the area of this frame is delineated the projection of all the others.
Thus the plane of projection limits the different breadths of a ship in various points of her length, and exhibits the outline of the timbers respectively to each other, as they are erected upon the keel. Accordingly, this draught ought to present a variety of sections of the ship in different places of her length, and always perpendicular to the surface of the water; so that the eye of the observer, when placed in what may be properly termed theaxisof the ship, may perceive the several sections at one glance, that is to say, when looking full on the stem, from before the ship, (See plateV. fig. 4.) he shall discover the fore-timbers; and when looking from behind, directly on the stern, he shall perceive the form of the after-timbers, (See plateX. fig. 2 and 3.) in both of which figures the sections of the inferior timbers are expressed by curved black lines drawn upon the area of the midship-frame, which is already described to be a plane elevated perpendicularly upon the keel at the extreme breadth of the vessel.
To form a just idea of this plane, therefore, we ought to suppose a ship resting upon the stocks, in the same position as when afloat upon the water. Thus a variety of black vertical lines may be drawn at equal distances upon the bottom, which is white, to form different outlines of the ship corresponding to the timbers within. It is to be observed, that the fashion of the inferior timbers must conform to the figure of the midship-frame, which is placed in the fullest part of the ship; and as the planes of all the other timbers diminish in a certain progression as they approach the stem and stern, they are properly delineated on the plane of the midship-frame, which also represents the depth of the keel and length of the midship-beam.
As the two sides of a ship ought to be exactly alike, it is judged sufficient to represent the sections of the fore-part of the ship on the left side, and those in the after-part on the right side, so as to perceive all the sections, as well afore as abaft, upon one plane. See plateI.Projection.
However necessary it may be to understand precisely the vertical curves of the bottom, it is no less requisite to have a just idea of those which are horizontal.
The horizontal, or floor plane, is that upon which the whole frame is erected, and will be more clearly understood by previously describing the water-lines and ribbands, of which it is composed.
When a ship floats upon the stream, it is evident that her upper-works will be separated from the bottom by the surface of the water, which will accordingly describe an imaginary horizontal line upon the bottom from the stem to the stern-post.
The most elevated of those lines is termed the load-water-line, which is supposed to be drawn by the surface of the water on the upper part of the bottom, when she is sufficiently laden for a sea-voyage. For if we suppose this surface a rule, and thereby describe a corresponding black line along the vessel’s bottom, that line will be distinguished upon the bottom, which is white, and represent what is called the load-water-line.
If the ship is lightened of any part of her lading, and preserves the same difference in her draught of water at the two ends, or, what is the same thing, if she is lightened so as to preserve the same equilibrium of the keel with regard to the surface of the water, it is evident that she will rise higher out of the water, so that the black line already described will be elevated above it, and another black line may be delineated upon the bottom, close to the surface of the water, which will exhibit a second water-line parallel to the first, but nearer the keel in proportion to the number of feet which the ship has risen.
Thus by lightening a ship gradually, and at the same time preserving the direction of her keel, or the angle which the keel makes with the surface of the water, a variety of water-lines may be drawn parallel to each other, and to the load-water-line. See a farther illustration of these lines in the articleWater-Line. See also their figure on a ship’s bottom, plateI. fig. 5.
The ribbands are likewise of great utility in ship-building; they are narrow and flexible planks placed on the bottom at different heights, so as to form a sort of mould for stationing the inferior timbers between the principal ones. They differ from the water-lines, inasmuch as the latter have only one curve, which is horizontal, whereas the ribbands, besides their horizontal one, have a vertical curve. To convey a just idea of these curves, which cannot be represented on one draught at their full length, without an oblique section of the ship’s length, it will be necessary to have recourse to two planes; that of the elevation, which exhibits their vertical curve; and to the floor-plane, upon which the horizontal curve is expressed. SeeRibbands.
These different lines are extremely useful in exhibiting the various curves of a ship’s bottom, that as they are gradually diminished, their uniformity or irregularity may be discovered by the skilful artist.
We have already observed, that the qualities required in a ship ought to determine the figure of the bottom: a ship of war therefore should be able to sail swiftly, and carry her lower tier of guns sufficiently out of the water. A merchant-ship ought to contain a large cargo of merchant-goods, and be navigated with few hands; and both should be able to carry sail firmly; steer well; drive little to leeward; and sustain the shocks of the sea without being violently strained.
The first thing to be established in the draught of a ship is her length; and as a ship of war, according to her rate, is furnished with a certain number of cannon, which are placed in battery on her decks, it is necessary that a sufficient distance should be left between their ports to work the guns with facility, and particularly to leave space enough between the foremost gun and the stem, and between the aftmost gun and the stern-post on each side, on account of the arching, or inward curve of the ship towards her extremities.
When the length of a ship is determined, it is usual to fix her breadth by the dimensions of the midship-beam. On this occasion the shipwrights, for the most part, are conducted by rules founded on their own observation; for having remarked, that some vessels which by repeated experience have been found to answer all the purposes of navigation, have a certain breadth in proportion to their length, they have inferred that it would be improper to depart from this proportion: but as other ships have been constructed with different breadths, which were equally perfect, a variety of different general rules have been adopted by these artists, who are accordingly divided in their opinions about the breadth which ought to be assigned to a ship relatively with her length, whilst each one produces reasons and experience in support of his own standard. Those who would diminish the breadth alledge, that a narrow vessel meets with less resistance in passing through the water; 2dly. That by increasing the length she will drive less to leeward; 3dly. That according to this principle, the water-lines will be more conveniently formed to divide the fluid; 4thly. That a long and narrow ship will require less sail to advance swiftly; that her masts will be lower, and her rigging lighter; and, by consequence, the seamen less fatigued with managing the sails, &c.
Those, on the contrary, who would enlarge the breadth, pretend, 1st. That this form is better fitted to preserve a good battery of guns. 2dly. That there will be more room to work the guns conveniently. 3dly. That by carrying more sail the ship will be enabled to run faster; or, that this quality will at least overbalance the advantage which the others have of more easily dividing the fluid. 4thly. That, being broader at the load-water-line, or place where the surface of the water describes a line round the bottom, they will admit of being very narrow on the floor, particularly towards the extremities: and 5thly. That a broad vessel will more readily rise upon the waves than a narrow one.
From such opposite principles has resulted that variety of standards adopted by different shipwrights; and a servile imitation of these mechanical methods has, to the great reproach of the art, produced all these pretended rules of proportion: for the various models they have hitherto adopted indisputably prove their doubt and uncertainty with regard to their proper standard. Hence these pretended mysteries which are only to be revealed to such as are initiated into the craft! Hence this division of the art into classes, or, according to the technical term, intofamilies, each of which affects, with becoming solemnity, to be possessed of the true secret, in preference to all the others! And hence violence of opposition, and mutual contempt amongst the artists! Indeed nothing appears more effectually to have retarded the progress of naval architecture, than the involving it in mysteries which the professors would gravely insinuate are only intelligible to themselves. This ridiculous affectation is nevertheless tenaciously retained, notwithstanding the example to the contrary of some of the most able shipwrights in Europe, who are real masters of the theory of their art, and do honour to their profession, and who are justly exempted from the censure to which the others are often exposed.
It is not to be expected that an art so complicated and various, comprehending such a diversity of structures, can be treated at large in a work of this sort. To enter into a particular detail of the theory and practice; to explain the different parts with sufficient accuracy and perspicuity, would of itself require a large volume, and, by consequence, greatly exceed the limits of our design. Being thus necessitated to contract our description into a narrow compass, it will be sufficient to give a general idea of the subject; to describe the principal pieces of which a ship is composed, and to explain the principal draughts used in the construction thereof.
As the several lines exhibited in the planes of elevation, projection, &c. will be rendered more intelligible by a previous account of those pieces, it may not be improper to begin with reciting their names, and giving a summary description of their uses and stations. They are for the most part represented according to the order of their disposition in that part of plateI. which is termedPiecesof theHull.
A. The pieces which compose the keel, to be securely bolted together, and clinched.
B. The stern-post, which is tenanted into the keel, and connected to it by a knee, G. It supports the rudder, and unites the sides of the ship abaft.
C. The stem, which is composed of two pieces scarfed together: it is an arching piece of timber, into which the ship’s sides are united forwards.
D. The beams, which are used to support the decks, and confine the sides to their proper distance.
E. The false post, which serves to augment the breadth of the stern-post, being also tenanted into the keel.
F. The knees, which connect the beams to the sides.
G. The knee of the stern-post, which unites it to the keel.
H. The apron, in two pieces: it is fayed on the inside of the stem, to support the scarf thereof; for which reason, the scarf of the former must be at some distance from that of the latter.
I. The stemson, in two pieces, to reinforce the scarf of the apron.
K. The wing transom: it is fayed across the stern-post, and bolted to the head of it, having its two ends let into the fashion-pieces.
L. The deck transom, parallel to the wing-transom, and secured in the same manner.
M. N. The lower transoms.
O. The fashion-piece on one side; the heel of it is connected with the stern-post, and the head is secured to the wing-transom.
P. The top-timbers, or upper parts of the fashion-pieces.
Q. The sleepers, which fasten the transoms to the ship’s side.
R. The breast-hooks, in the hold; they are fayed across the stem, to strengthen the fore part of the ship.
S. The breast-hooks of the deck: they are placed immediately above the former, and used for the same purposes.
T. The rudder, which is joined to the stern-post by hinges, and serves to direct the ship’s course.
U. The floor-timbers; they are laid across the keel, to which they are firmly bolted.
V. The lower futtocks, and
W. The top-timbers, which are all united to the floor-timbers, forming a frame that reaches from the keel to the top of the side.
X. The pieces which compose the kelson: they are scarfed together like the keel pieces, and placed over the middle of the floor-timbers, upon each of which they are scored about an inch and a half, as exhibited by the notches.
Y. The several pieces of the knee of the head; the lower part of which is fayed to the stem; the heel being scarfed to the fore-foot.
Z. The cheeks of the head or knees, which connect the head to the bows on each side.
&. The standard of the head, which fastens it to the stem.
a. The catheads, one of which lies on each bow, projecting outwards like the arm of a crane. They are used to draw the anchors up to the top of the side without injuring the bow.
b. The bits, to which the cable is fastened when the ship rides at anchor.
c. The false post, in two pieces, fayed to the fore part of the stern-post.
d. The side-counter-timbers, which terminate the ship abaft within the quarter gallery.
e e. Two pieces of dead wood, one afore, and another abaft, fayed on the keel.
In vessels of war, the general dimensions are established by authority of officers appointed by the government to superintend the building of ships. In the merchants service, the extreme breadth, length of the keel, depth in the hold, height between-decks and in the waste, are agreed on by contract; and from these dimensions the shipwright is to form a draught suitable to the trade for which the ship is designed.
In projecting the draught of a vessel of war, the first article to be considered is her length. As all ships are much longer above than below, it is also necessary to distinguish the precise part of her height from which her length is taken: this is usually the lower gun-deck, or the load water-line. It has been already observed, that water-lines are described longitudinally on a ship’s bottom by the surface of the water in which she floats, and that the line which determines her depth under the water is usually termed the load-water-line. In this draught it will be particularly necessary to leave sufficient distance between the ports.
The next object is to establish the breadth by the midship-beam. Although there is great difference of opinion about proportioning the breadth to the length, yet it is most usual to conform to the dimensions of ships of the same rate. After the dimensions of the breadth and length are determined, the depth of the hold must be fixed, which is generally half the breadth: but the form of the body should be considered on this occasion; for a flat floor will require less depth in the hold than a sharp one. The distance between the decks must also be settled.
We may then proceed to fix the length of the keel, by which we shall be enabled to judge of the rake of the stem and stern-post. The rake is known to be the projection of the ship at the height of the stem and stern-post, beyond the ends of the keel afore and abaft; or the angle by which the length is increased as the fabric rises. To these we may also add the height of the stem and wing transom.
After these dimensions are settled, the timbers may be considered which form the sides of the ship. A frame of timbers, which appears to be one continued piece, is composed of one floor-timber, U, whose arms branch outward to both sides of the ship; (See plateI.Piecesof theHull) two or three futtocks V V, and a top-timber, W. The futtocks are connected to the upper arms of the floor-timbers on each side of the ship, and serve to prolong the timber in a vertical direction: and the top-timbers are placed at the upper part of the futtocks for the same purpose. All these being united, and secured by cross-bars, form a circular enclosure, which is called a frame of timbers,couple d’un vaisseau. And as a ship is much broader at the middle than at the extremities, the arms of the floor-timber will form a very obtuse angle at the extreme breadth; but this angle decreases in proportion to the distance of the timbers from the midship-frame, so that the foremost and aftmost ones will form a very acute angle. Floor-timbers of the latter sort are usually called crutches.
Shipwrights differ extremely in determining the station of the midship-frame; some placing it at the middle of the ship’s length, and others further forward. They who place it before the middle, alledge, that if a ship is full forward, she will meet with no resistance after she has opened a column of water; and that the water so displaced will easily unite abaft, and by that means force the ship forward; besides having more power on the rudder, in proportion to its distance from the center of gravity: this also comes nearer the form of fishes, which should seem the most advantageous for dividing the fluid.
When the rising of the midship-floor-timber is decided, we may then proceed to describe the rising-line of the floor, on the stern-post abaft, and on the stem afore.
The height of the lower-deck is the next thing to be considered: it is determined in the middle by the depth of the hold; and some builders make it no higher than the stem; but they raise it abaft as much above its height in the middle, as the load-water-mark, or draught of water abaft, exceeds that afore. With regard to the height between decks, it is altogether arbitrary, and must be determined by the rate of the ship, and the service she is designed for.
It is also necessary to remember the sheer of the wales, and to give them a properhanging; because the beauty and stateliness of a ship greatly depend upon their figure and curve, which, if properly drawn, will, make her appear airy and graceful on the water.
We come now to consider the upper-works, and all that is above water, called the dead-work: and here the ship must be narrower, so that all the weight lying above the load-water-line will thereby be brought nearer the middle of the breadth, and of course the ship will be less strained by the working of her guns, &c. But although some advantages are acquired by diminishing the breadth above water, we must be careful not to narrow her too much; as there must be sufficient room left on the upper-deck for the guns to recoil. The security of the masts should likewise be remembered, which requires sufficient breadth to spread the shrouds. A deficiency of this sort may indeed be in some measure supplied by enlarging the breadth of the channels.
With regard to the qualities required in the construction of a ship, to fit her for the various purposes of navigation, the reader is referred to the articleBottom.
We shall now proceed to explain the sheer draught, or plane ofelevation, of a sixty gun ship; wherein we have been attentive to make the same letters refer to the same objects, as in the explanation of thePieces, as above; at least when the same objects are in both figures; a conduct we shall invariably pursue throughout this work, although it seems to have been forgot by our predecessors. Thus in all the plates of ship-building, the keel, whether separate or joined, is represented by A, the stern-post by B, the stem by C, the beams by D; unless where those objects do notallappear, and then something else is placed instead thereof. Thus in plateIII. of the deck, where the keel cannot be seen, the main hatchway is represented by A, as not being inserted in any figure wherein the keel appears.
A A. The keel, whose upper edge is prolonged by the dotted line p q, upon the extremities of which are erected perpendiculars which determine the height of the wing transom, K, and length of the gun-deck, K C.
A B. The stern-post.
A C. The stem.
D D. The quarter-gallery, with its windows.
E F. The quarter-pieces, which limit the stern on each side.
F. The taffarel, or upper piece of the stern.
F G. Profile of the stern, with its galleries.
H. The gun ports.
I. The channels, with their dead-eyes and chain-plates.
K. The wing-transom.
K G. The counter.
L B. The deck-transom.
M N O. The first, second, and third transoms, of which O K is the third or lowest.
mO L P. The direction of the fashion-piece, having its breadth canted aft towards the stern.
Q R. The main skeeds, for hoisting in the boats clear of the ship’s side. L Q Z. The main wale, with its sheer afore and abaft.
D R X. The channel wales, parallel to the main wale.
S U S. The sheer rail, parallel to the wales.
Tt. The rudder.
A t F. The rake of the stern.
V W V. The waist-rail.
Pi i. The drift-rails abaft; andia, the drift-rails forward.
T U C. The water-line.
X X. The rails of the head.
Y. The knee of the head, or cutwater.
Z Z. The cheeks of the head.
a a. The cat-head.
M ⊕ C. The rising line of the floor.
kuC. The cutting-down line, which limits the thickness of all the floor-timbers, and likewise the height of the dead-wood afore and abaft.
⊕uU W. The midship-frame.
a,b,c,d,e,f,g,h. The frames or timbers in the fore-body of the ship, i. e. before the midship frame.
1, 2, 3, 4, 5, 6, 7, 8, 9. The timbers in the after-body, or which are erected abaft the midship-frame.
As the eye of a spectator is supposed in this projection to view the ship’s side in a line perpendicular to the plane of elevation, it is evident that the convexity will vanish, like that of a cylinder or globe, when viewed at a considerable distance; and that the frames will consequently be represented by strait lines, except the fashion-piece abaft and the knuckle-timber forward.
It has been already observed, that the plane of projection may be defined a vertical delineation of the curves of the timbers upon the plane of the midship-frame, which is perpendicular to that of the elevation. It is necessary to observe here, that the various methods by which these curves are described, are equally mechanical and arbitrary. In the latter sense, they are calculated to make a ship fuller or narrower according to the service for which she is designed, and in the former they are drawn according to those rules which the artist has been implicitly taught, to follow, or which his fancy or judgment has esteemed the most accurate and convenient. They are generally composed of several arches of a circle, reconciled together by moulds framed for that purpose. The radii of those arches therefore are of different lengths, according to the breadth of the ship in the place where such arches are swept; and they are expressed on the plane of projection either by horizontal or perpendicular lines; the radii of the breadth sweeps being always in the former, and the radii of the floor sweeps in the latter direction. These two arches are joined by a third, which coincides with both, without intersecting either. The curve of the top-timber is either formed by a mould which corresponds to the arch of the breadth-sweep, or by another sweep, whose center and radius are without the plane of projection. The breadth of the ship at every top-timber is limited by an horizontal line drawn on the floor-plane, called the half-breadth of the top-timbers. The extreme breadth is also determined by another horizontal line on the floor-plane; and the lines of half-breadth are thus mutually transferable, from the projection and floor-planes, to each other.
The necessary data by which the curves of the timbers are delineated then are, the perpendicular height from the keel, the main or principal breadth, and the top-timber breadth: for as a ship is much broader near the middle of her length than towards the ends, so she is broader in the middle of her height than above and below; and this latter difference of breadth is continued throughout every point of her length. The main breadth of each frame of timbers is therefore the ship’s breadth nearly in the middle of her height in that part: and the top-timber breadth is the line of her breadth near the upper ends of each timber. It has been already observed, that as both sides of a ship are alike, the artificers only draw one side, from which both sides of the ship are built: therefore the timbers abaft the midship frame are exhibited on one side of the plane of projection, and the timbers before it on the other.
A. The keel.
B C. The line which expresses the upper-edge of the keel, from which the height of each timber, and height of its different breadths are measured.
B D and C E, perpendiculars raised on the line B C, to limit the ship’s extreme breadth and height amid-ships; or, in other words, to limit the breadth and height of the midship-frame.
A F. A perpendicular erected from the middle of the keel to bisect the line of the ship’s breadth in two equal parts.
F * 9. The half-breadth line of the aftmost top-timber; being the uppermost horizontal line in this figure.
Note. The seven lines parallel to, and immediately under this, on the right side of the line A F, are all top-timber half-breadths, abaft the midship-frame; the lowest of which coincides with the horizontal line D E.
The parallel horizontal lines nearly opposite to these, on the left side of the line A F, represent the top-timber half-breadths in the fore-body, or the half-breadths of the top-timbers before the midship-frame.
G, H, I, Q, R, S, T. The radii of the breadth-sweeps abaft the midship-frame; those of the breadth-sweeps in the fore-body, or before the midship-frame, are directly opposite on the right side.
⊕ A ⊕. The midship-frame, from the extreme breadth downwards.
1, 2, 3, 4, 5, 6, 7, 8, 9. The out-lines of timbers abaft the midship-frame, in different parts of their height.
a,b,c,d,e,f,g,h. The outlines of the timbers before the midship-frame, in different parts of their height, h being the foremost, or knucke-timber.
Ki. The wing-transom, whose ends rest upon the fashion-piece.
L. The deck-transom, parallel to, and under the wing-transom.
M N O. The lower-transoms, of which O k is the third and lowest,
mkP. The dotted line, which expresses the figure of the fashion-piece, without being canted aft.