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Page 143 - Temperature may be conceived to depend upon the velocities of the vibrations ; increase of capacity, on the motion being performed in greater space ; and the diminution of temperature, during the conversion of solids into fluids or gases, may be explained on the idea of the loss of vibratory motion, in consequence of the revolution of particles round their axes, at the moment when the body becomes liquid or aeriform ; or from the loss of rapidity of vibration, in consequence of the motion of the...
Page 365 - I can only give you my conjectures. Suppose a great tract of country, land and sea, to wit, Florida and the Bay of Mexico, to have clear weather for several days, and to be heated by the sun, and its air thereby exceedingly rarefied. Suppose the country northeastward, as Pennsylvania, New England, Nova Scotia, and Newfoundland, to be at the same time covered with clouds, and its air chilled and condensed. The...
Page 365 - I have a fire in my chimney, there is a current of air constantly flowing from the door to the chimney ; but the beginning of the motion was at the chimney, where the air being rarefied by the fire rising, its place was supplied by the cooler air that was next to it, and the place of that by the next, and so on to the door. So the water in a long sluice or mill-race, being stopped by a gate, is at rest like the air in a calm ; but as soon as you open the gate at one end to let it out, the water next...
Page 359 - Spirit has given them Ocular Demonstration of the Success. About eighteen months ago, I made a Purchase of about three hundred Acres of Land near Burlington, and resolved to improve it in the best and Speediest manner, that I might be Enabled to indulge myself in that kind of life, which was most agreeable. My fortune, (thank God,) is such that I can enjoy all the necessaries and many of the...
Page 359 - Husbandry, and think the public may be much benefited by them ; but, if the farmers in your neighbourhood are as unwilling to leave the beaten road of their ancestors as they are near me, it will be difficult to persuade them to attempt any improvement. Where the cash is to be laid out on a probability of a return, they are very averse to the running any risk at all, or even expending freely, where a gentleman of a more public spirit has given them ocular demonstration of the success. About eighteen...
Page 364 - ... storms beginning to leeward. Some years since, there was an eclipse of the moon at nine o'clock in the evening, which I intended to observe; but before night a storm blew up at northeast, and continued violent all night and all next day ; the sky thick-clouded, dark, and rainy, so that neither moon nor stars could be seen.
Page 316 - ... beyond description. The shock lasted from two to three minutes, and during that short period the city of Bhooj was almost levelled with the ground. The walls, from the sandy nature of the stone, were crumbled into dust ; nearly all the towers and gateways were demolished; and the houses, which were left standing, were so shattered as to be uninhabitable. The fort, which stands at some distance from the city, is so breached as to be rendered useless as a place of defence. It is calculated that...
Page 362 - We have specimens of these seashell rocks, broken off near the tops of these mountains, brought and deposited in our library as curiosities. If you have not seen the like, I will send you a piece. Farther, about mountains (for ideas will string themselves like ropes of onions) ; when I was once riding in your country, Mr. Walker showed me at a distance the bluff side or end of a mountain, which appeared striped from top to bottom...
Page 143 - It seems possible to account for all the phenomena of heat, if it be supposed that in solids the particles are in a constant state of vibratory motion, the particles of the hottest bodies moving with the greatest velocity, and through the greatest space; that in fluids and elastic fluids, besides the vibratory motion, which must be conceived greatest in the last, the particles have a motion round their own axes, with different velocities, the particles of elastic fluids moving with the greatest quickness...
Page 366 - It will be agreeable to you to hear that our subscription goes on with great success, and we suppose will exceed 50001. of our currency. We have bought for the Academy the house that was built for itinerant preaching, which stands on a large lot of ground, capable of receiving more buildings to lodge the scholars, if it should come to be a regular college. The house is one hundred feet long and seventy wide, built of brick, very strong, and sufficiently high for three lofty stories.