“The dreadful spoutWhich shipmen do the hurricano callConstring’d in mass by the almighty sun.”Shakspeare(Troilus and Cressida.)
“The dreadful spoutWhich shipmen do the hurricano callConstring’d in mass by the almighty sun.”Shakspeare(Troilus and Cressida.)
“The dreadful spoutWhich shipmen do the hurricano callConstring’d in mass by the almighty sun.”Shakspeare(Troilus and Cressida.)
“The dreadful spout
Which shipmen do the hurricano call
Constring’d in mass by the almighty sun.”
Shakspeare(Troilus and Cressida.)
In number three hundred and two of the Monthly Magazine, Sir Richard Phillips, in describing a waterspout observed by him, points out the connection between those phenomena and hurricanes, and offers a very philosophicalexplanation of the formation of the former. It happened to him, he observes, on the twenty-seventh of June, 1817, about seven in the evening, to witness the formation, operation and extinction of what is called a waterspout. His attention was drawn to a sudden hurricane which nearly tore up the shrubs and vegetables in the western gardens, and filled the air with leaves and small collections of the recently cut grass. Very dark clouds had collected over the adjacent country, and some stormy rain, accompanied by several strokes of lightning, followed this hurricane of wind. The violence lasted a few minutes, and it was evident that a whirlwind agitated a variety of substances which had been raised into the air. The storm proceeded from west to east, that is, from Hampstead over Kentish-Town, toward Holloway. In about five minutes, in the direction of the latter place, a magnificent projection was visible from the clouds, somewhat like a tunnel, with the smallest part downward. It descended two-thirds of the distance from the clouds toward the earth, and evidently consisted of parts of clouds descending in a vortex, violently agitated like smoke from the chimney of a furnace recently supplied with fuel. It then shortened, and appeared to be drawn up toward the stratum of clouds, and finally drew itself into the cloud; but a small cone, or projecting thread, of varying size and length, continued for ten minutes. At the time, and for half an hour after, a severe storm of rain was visibly falling from the ruins of clouds connected with it, the extent being exactly defined by the breadth of Holloway, Highgate and Hornsey. About two hours after, it was found that one of the heaviest torrents of rain remembered by the inhabitants, had fallen around the foot of Highgate hill; and some persons having seen the projected cloud, an absolute belief existed that a waterspout had burst at the crossing of the new and old roads. On proceeding toward London, various accounts agreeing with the superstition or preconceived notions of the bystanders were given; and at one place it appeared that some haymakers were stacking hay from a wagon which stood between two ricks, and that the same whirlwind which passed over Kentish-Town, had passed over the loaded wagon with an impetus sufficient to carry it about twenty yards from its station, and to put the men on it and on the rick, in fear of their lives. Passing the road, it carried with it a stream of hay, and, nearly unroofing a shed on the other side, filled the air to a great hight with fragments of hay, leaves and boughs of trees, which resembled a vast flight of birds. A family in the vicinity beheld the descending cloud, or waterspout, pass over, and saw its train, which, at the time, they took to be a flight of birds. They afterward beheld the descending cloud draw itself upward, and they and other witnesses described it as a vast mass of smoke working about in agitation; to them it was nearly vertical in anorthern direction; and to persons a quarter of a mile north, it was nearly vertical in a southern direction; and all agree that it drew itself up without rain, and was followed near the earth by the train of light bodies. It appeared also, on various testimony, to let itself down in a gradual and hesitating manner, beginning with a sort of knob in the cloud, and then descending lower, and curling and twisting about till it shortened, and gradually drew itself into the cloud.
The inferences which Sir Richard draws from what he saw and heard, are as follows. That the phenomenon called a waterspout is a mere collection of clouds, of the same rarity as the mass whence they are drawn. That the descent is a mechanical effect of the whirlwind, which creating a vacuum, or high degree of rarefaction, extending between the clouds and the earth, the clouds descend in it by their gravity, or by the pressure of the surrounding clouds or air. That the convolutions of the descending mass, and the sensible whirlwind felt at the earth, as well as the appearance of the commencement, increase and decrease of the mass, all demonstrate the whirl of the air to be the mechanical cause. That the same vortex, whirl or eddy of the air, which occasions the clouds to descend, occasions the loose bodies on the earth to ascend. That, if in this case the lower surface had been water, the same mechanical power would have raised a body of foam, vapor and water, toward the clouds. That, as soon as the vortex or whirl exhausts or dissipates itself, the phenomena terminate by the fall to the lower surface of the light bodies or water, and by the ascent of the cloud. That when water constitutes the light body of the lower surface, it is probable that the aqueous vapor of the cloud, by coalescing with it, may occasion the clouds to condense, and fall at that point, as through a siphon. That if the descending cloud be highly electrified, and the vortex pass over a conducting body, as a church steeple, it is probable it may be condensed by an electrical concussion, and fall at that spot, discharging whatever has been taken up from the lower surface, and producing the strange phenomena of showers of frogs, fish, &c. And, lastly, it appears certain, that the action of the air on the mass of clouds, pressing toward the mouth of the vortex as to a funnel, (which, in this case, it exactly represented,) occasioned such a condensation as to augment the simultaneous fall of rain to a prodigy.
In the month of July, 1800, a waterspout was seen rapidly to approach a ship navigating between the Lipari islands. It had the appearance of a viscid fluid, tapering in its descent, and proceeding from the cloud to join the sea. It moved at the rate of about two miles an hour, with a loud sound of rain, passing the stern of the ship, and wetting the after part of themainsail. It was thence concluded that waterspouts are not continuous columns of water, which has been confirmed by subsequent observations.
In November, 1801, about twenty miles from Trieste, in the Adriatic sea, a waterspout was seen eight miles to the southward: round its lower extremity was a mist, twelve feet high, nearly of the form of an Ionian capital, with very large volutes, the spout resting obliquely on its crown. At some distance from this spout, the sea began to be agitated, and a mist rose to the hight of about four feet: a projection then descended from the black cloud which was impending, and met the ascending mist about twenty feet above the sea, the last ten yards of the distance being described with great rapidity. A cloud of a light color appeared to ascend in this cloud like quicksilver in a glass tube. The first spout then snapped at about one-third of its hight, the inferior part subsiding gradually, and the superior curling upward. Several other projections from the cloud, appeared with corresponding agitations of the water below, but not always in spouts vertically under them: seven spouts in all were formed, and two other projections reabsorbed. Some of the spouts were not only oblique, but curved, the ascending cloud moving most rapidly in those which were vertical. They lasted from three to five minutes, and their dissipation was not attended with any fall of rain. For some days before the weather had been very rainy, with a south-east wind, but not any rain had fallen on the day of observation.
In some cases, however, the waterspout at sea, is a continuous column of water, carried upward from the surface of the waves, and possibly meeting with water brought down from the clouds and condensed by the force of the revolving hurricane. Such waterspouts are now and then seen on the ocean, having an appearance like that represented in the cut on the next page. And as the wind blows first this way, and then that, they often writhe and bend, from one point to another, while the sea below, and all around, is agitated and covered with foam. Woe to that vessel that comes within the reach of one of these mighty phenomena. It would be crushed and sunk like a leaf on the waters. The usual defense at sea is to fire a cannon-shot into the whirling waterspout, which commonly breaks and dispels it, and causes the water to fall in a tremendous cataract or shower.
WATERSPOUT ON THE OCEAN.
WATERSPOUT ON THE OCEAN.
WATERSPOUT ON THE OCEAN.
Waterspouts, however, are not confined to the ocean. They are occasionally witnessed on the great fresh-water lakes of our own country, as they have been on the inland seas of other parts of the globe. Several of these remarkable phenomena were seen in 1854, on Lake Ontario, two of which were visible at Sodus point. They were dense, cone-shaped columns, and formed a continuous line from the earth to the clouds. One of them, the largest, which was nearly thirty feet in diameter, was precipitated against thebluffs, and broke with a deafening noise upon the rocks below, causing so great a commotion of the waters that a large quantity of logs and lumber were torn from their moorings and washed far out into the lake. The smaller of the two pursued its terrific and onward course as far as the eye could reach, filling the beholders with wonder and astonishment, and awakening such a feeling of grandeur and sublimity that they stood almost mute and statue-like, until the sound of this gigantic column of water died far away in the distance. A portion of the pier of the light-house was swept away by the elements, and considerable damage was done to the light-house. There was a severe storm out on the lake, and several schooners, brigs, &c., came scudding in, under bare poles, seeking security from the tempestuous billows without, upon the placid bosom of the harbor. The velocity and power of the whirlwind which caused these waterspouts, were very great. As it passed on westward in its furious course, it is said that in a town in Ohio, a grove of oak-trees was almost entirely blown down by it. The trunk of one of these trees, on being measured, was found to be about three feet in diameter. Assuming, however, that its diameter was but two and a halffeet, it would require to break it, a force of one hundred and forty-nine thousand pounds. The surface of the tree exposed to the action of the wind, was about one thousand square feet, which would give a pressure by the wind of one hundred and forty-seven pounds to the square foot, or a velocity of not less than one hundred and seventy-one miles per hour, which is nearly one-fourth the velocity of a cannon-ball just leaving the cannon. Allowing the hight of the hurricane or whirlwind to have been sixty feet, the whole force exerted, at one time, along its track, was equal to more than half the steam power of the globe!
These corresponding phenomena of whirlwinds have been occasionally productive of much mischief, as the following brief narratives will show. On the thirtieth of October, 1669, about six in the evening, the wind being then westwardly, a formidable whirlwind, scarcely of the breadth of sixty yards, and which spent itself in about seven minutes, arose at Ashly, in Northamptonshire, England. Its first assault was on a milkmaid, whose pail and hat were taken from off her head, and the former carried many scores of yards from her, where it lay undiscovered for some days. It next stormed a farmyard, where it blew a wagon body off the axletrees, breaking in pieces the latter, and the wheels, three of which, thus shattered, were blown over a wall. Another wagon, which did not, like the former, lie across the passage of the wind, was driven with great speed against the side of the farm-house. A branch of an ash-tree, so large that two stout men could scarcely lift it, was blown over a house without damaging it, although torn from a tree one hundred yards distant. A slate was carried nearly two hundred yards, and forced against a window, the iron bar of which it bent. Several houses were stripped; and in one instance, this powerful gust, or stream of air, forced open a door, breaking the latch; whence it passed through the entry, and, forcing open the dairy door, overturned the milk-pans, and blew out three panes of glass. It next ascended to the chambers, and blew out nine other panes. Lastly, it blew a gate-post, fixed two feet and a half in the ground, out of the earth, and carried it many yards into the fields.
On the thirtieth of October, 1731, at one in the morning, a very sudden and terrific whirlwind, having a breadth of two hundred yards, was experienced at Cerne-Abbas, in Dorsetshire. From the south-west side of the town, it passed to the north-east, crossing the center, and unroofing the houses in its progress. It rooted up trees, broke others in the middle, of at least a foot square, and carried the tops a considerable distance. A sign-post, five feet by four, was broken off six feet in the pole, and carried across a street forty feet in breadth, over a house opposite. The pinnacles and battlements of one side of the church-tower were thrown down, and the leadsand timber of the north aisle broken in by their fall. A short time before, the air was remarkably calm. It was estimated that this sudden and terrible gust did not last more than two minutes.
About the middle of August, 1741, at ten in the morning, several peasants being on a heath near Holkham, in Norfolk, perceived, about a quarter of a mile from them, a wind like a whirlwind approach them gradually, in a straight line from east to west. It passed through the field where they were plowing, and tore up the stubble and grass in the plowed ground, for two miles in length, to the breadth of thirty yards. In reaching an inclosure at the top of a rising ground, it appeared like a great flash or ball of fire, emitting smoke, and accompanied by a noise similar to that of carts passing over a stony ground. Both before and after the wind passed, there was a strong smell of sulphur; and the noise was heard long after the smoke had been perceived. This fiery whirlwind moved so slowly forward, that it was nearly ten minutes in proceeding from the inclosure to a farm-house in the vicinity, where it did much mischief.
Sound is propagated successively from the sounding body to the places which are nearest to it, then to those more distant, &c. Every observer knows that when a gun is fired at a considerable distance from him, he perceives the flash a certain time before he hears the report; and the same thing is true with respect to the stroke of a hammer, or of a hatchet, the fall of a stone, or, in short, any visible action which produces a sound or sounds. In general, sound travels through the air at the rate of eleven hundred and forty-two feet in a second, or about thirteen miles in a minute. This is the case with all kinds of sounds; the softest whisper flying as fast as the loudest thunder. Sound, like light, after it has been reflected from several places, may be collected into one point as a focus, where it will be more audible than in any other part; and on this principle whispering galleries are constructed. The particulars relative to the celebrated whispering gallery in the dome of St. Paul’s church, London, will be comprehended in the description of that noble edifice.
An echo is the reflection of sound striking against a surface adapted to the purpose, as the side of a house, a brick wall, hill, &c., and returning back again to the ear, at distinct intervals of time. If a person stand about sixty-five or seventy feet from sucha surfacea surface, and perpendicularly to it, and speak, the sound will strike against the wall, and be reflected back, so that he will hear it as it goes to the wall, and again on its return. If a bellsituated in the same way be struck, and an observer stand between the bell and the reflecting surface, he will hear the sound going to the wall, and also on its return. Lastly, if the sound strike the wall obliquely, it will go off obliquely, so that a person who stands in a direct line between the bell and the wall will not hear the echo. According to the greater or less distance from the speaker, a reflecting object will return the echo of several, or of fewer syllables; for all the syllables must be uttered before the echo of the first syllable reaches the ear, to prevent the confusion which would otherwise ensue. In a moderate way of speaking, about three and a half syllables are pronounced in one second, or seven syllables in two seconds: therefore, when an echo repeats seven syllables, the reflecting object is eleven hundred and forty-two feet distant; for sound travels at the rate of eleven hundred and forty-two feet per second, and the distance from the speaker to the reflecting object, and again from the latter to the former, is twice eleven hundred and forty-two feet. When the echo returns fourteen syllables, the reflecting object must be twenty-two hundred and eighty-four feet distant, and so on.
The most remarkable echo recorded, is at the palace of a nobleman, within two miles of Milan, in Italy. The building is of some length in front, and has two wings jutting forward; so that it wants only one side of an oblong figure. About one hundred paces before the mansion, a small brook glides gently; and over this brook is a bridge forming a communication between the mansion and the garden. A pistol having been fired at this spot, fifty-six reiterations of the report were heard. The first twenty were distinct; but in proportion as the sound died away, and was answered at a greater distance, the repetitions were so doubled that they could scarcely be counted, the principal sound appearing to be saluted in its passage by reports on either side at the same time. A pistol of a larger caliber having been afterward discharged, and consequently with a louder report, sixty distinct reiterations were counted. From this example it follows, that the further the reflecting surface is, the greater number of syllables the echo will repeat; but that the sound will be enfeebled nearly in the same proportion, until at length the syllables can not be distinctly heard. On the other hand, when the reflecting object is too near, the repetition of the sound reaches the ear, whilst the perception of the original sound still continues, in which case an indistinct resounding is heard, as may be observed in empty rooms, passages, &c. In such places, several reflections from the walls to the hearer, as also from one wall to the other, and then to the hearer, clash with each other, and increase the indistinctness of the sound.