Transactions of the American Philosophical Society, Volume 4American Philosophical Society, 1799 Held at Philadelphia for promoting useful knowledge. |
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Transactions of the American Philosophical Society, Volume 7;Volume 13 American Philosophical Society Volledige weergave - 1841 |
Transactions of the American Philosophical Society, Volume 5;Volume 11 American Philosophical Society Volledige weergave - 1837 |
Veelvoorkomende woorden en zinsdelen
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Populaire passages
Pagina 45 - ... the ratio of the velocity of the Earth in its orbit to the velocity of light, might not need correction or modification.
Pagina 287 - Secondly, We shall add greatly to their happiness, for however well they appear to be satisfied with their color, there are many proofs of their preferring that of the white people.
Pagina 30 - ... vibrate quicker in a denfe medium than in one more rare, contrary to what takes place with common pendulums. I made a compound pendulum on the principles above mentioned, of about one foot in its whole length. This pendulum, on many trials, made in the air 57 vibrations in a minute. On...
Pagina 300 - I have no doubt but he would have found wood where he might have fixed the screw, or if the ship were sheathed with copper he might easily have pierced it ; but not being well skilled in the management of the vessel, in attempting to move to another place he lost the ship. After seeking her in vain for...
Pagina 295 - When the skilful operator had obtained an equilibrium, he could row upward, or downward, or continue at any particular depth, with an oar, placed near the top of the vessel, formed upon the principle of the screw, the axis of the oar entering the vessel; by turning the oar one way he raised the vessel, by turning it the other way he depressed it.
Pagina 301 - London, by drawing a machine against her side by means of a line. The machine was loaded with powder, to be exploded by a gunlock, which was to be unpinioned by an apparatus to be turned by being brought alongside of the frigate. This machine fell in with a schooner at anchor astern of the frigate, and concealed from my sight.
Pagina 295 - An oar, formed upon the principle of the screw, was fixed in the fore part of the vessel ; its axis entered the vessel, and being turned one way, rowed the vessel forward, but being turned the other way rowed it backward ; it was made to be turned by the hand or foot.
Pagina 313 - Scotland, or the mountains of Auvergne, would have been without a boat at its door, a rill of water in every field, and a road to its market town. " Had the money we have lost by the lawless depredations of all the belligerent powers been employed in the same way, what communications would have been opened of roads and waters ! Yet, were we to go to war for redress, instead of redress we should plunge deeper into loss, and disable ourselves for half a century more from attaining the same end.
Pagina 297 - ... it upon the top of the tube. Behind the fub-marine veflel, was a place, above the rudder, for carrying a large powder magazine, this was made of two pieces of oak timber, large enough when hollowed out to contain one hundred and fifty pounds of powder, with the apparatus ufed in firing it, and was fecured in its place by a fcrew, turned by the operator. A ftrong piece of rope extended from the magazine to the woodfcrew (AJ above mentioned, and was faftened to both.
Pagina 76 - ... and by steadfastly looking at them possess them with infatuation: be the cause what it may, the miserable creatures undoubtedly strive by every possible means to escape, but alas! their endeavours are in vain, they at last lose the power of resistance, and flutter or move slowly, but reluctantly, towards the yawning jaws of their devourers, and creep into their mouths, or lie down and suffer themselves to be taken and swallowed.