The Laws of Gravitation; Memoirs by Newton, Bouguer and Cavendish, Together with Abstracts of Other Important Memoirs
Sir Isaac Newton
Paperback
(RareBooksClub.com, May 16, 2012)
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...placed with its ball close to the case, and as near to that part to which the weight was approached as could be done with safety; the thermometers being so placed, that when the weights were in the negative position, both could be seen through one of the telescopes, by means of light reflected from a concave mirror. Motion of arm on moving weights from midway to--=3.03-to + =5.9 Motion of arm on moving weights from midway to--= 3.15-to+ = 6.1 15.7 26.7 16.6 25.9 18.1 25.5 Weights mtmed to positive position 0h 1' 8 21.42 15--53.15 Two extreme points missed 36 43 21.9 50 Motion of arm on moving weights from midway to--=3.13--to +=5.72 In these three experiments, the effect of the weight appeared to increase from two to five tenths of a division, on standing an hour; and the thermometers shewed, that the weights were three or five tenths of a degree warmer than the air close to the case. In the two last experiments, I put a lamp into the room, over night, in hopes of making the air warmer than the weights, but without effect, as the heat of the weights exceeded that of the air more in these two experiments than in the former. On the evening of October 17, the weights being placed in the midway position, lamps were put under them, in order to warm them; the door was then shut, and the lamps suffered to burn out. The next morning it was found, on moving the weights to the negative position, that they were 7.5 warmer than the air near the case. After they had continued an hour in that position, they were found to have cooled 1.5, so as to be only 6 warmer than the air. They were then moved to the positive position; and in both positions the arm was drawn aside about four divisions more, after the weights had remained an hour in that position, than it was at first...