. Annals of Philosophy. 404 Scientific Intelligence. [May, train. Both balls appeared to have had great force. The ball from the muzzle went clear through a sort of flag slate, about three quarters of an inch thick, which was placed before it. The ball from the breech struck the ground, which it ploughed up, and then hit a large stone, which altered its shape. The first ball, after passing through the flag slate, was found at the bottom of a wall, which it had also struck, and which had flattened it nearly into the form of a penny piece. Probably the great tenacity of the iron of which gun-bar
. Annals of Philosophy. 404 Scientific Intelligence. [May, train. Both balls appeared to have had great force. The ball from the muzzle went clear through a sort of flag slate, about three quarters of an inch thick, which was placed before it. The ball from the breech struck the ground, which it ploughed up, and then hit a large stone, which altered its shape. The first ball, after passing through the flag slate, was found at the bottom of a wall, which it had also struck, and which had flattened it nearly into the form of a penny piece. Probably the great tenacity of the iron of which gun-barrels are made is the only thing of practical use to be deduced from these experiments. I am persuaded, however, that many of your readers will think them curious: and if you should think fit to give them a place in the Annals, the accompanying sketch will give a clearer idea of the form of the barrel than any description. It is to be observed, however, that the curve is not all in the same plane ; for when laid on a surface, it only touches from A to D; the remaining portion rises gradually in a kind of spiral curve, until the muzzle, C, is about five inches clear of the surface ; so that the ball had its direction twice altered before getting i *„. J 5i A B C Ft. ii. Length of the barrel straight 3 4 Length of the line A BC 2 7 Length of the line BD 0 lfJA 1 remain, dear Sir, yours most truly, J. Menzies. IX. On the Introduction of Vaccine Matter into America. (To Dr. Thomson.) SIR, In the last number of your Annals a correspondent under the signature of G. expresses his surprise to find it stated in my Me- moirs of the Life and Writings of the late Dr. Lettsom, that the vaccine lymph was first sent across the Atlantic by Dr. L., and con- signed to the care of his friend Dr. Waterhouse, of Cambridge, Massachusetts, from whence it spread through the United States. This is said to be untrue; that " vaccine lymph had been previously sent by Dr. George Pearson to D
Size: 2503px × 998px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., 1817, bookcentury1800, bookdecade1810, bookpublisherlondon, bookye
