. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 202 RECENT STUDIES TX GRAVITATION. distance between them and the force G M, M, /•'. of course Cavendish's resuH gives (J. or, knowing the attraction of a big sphere on a ball, and knowing the attraction of the earth on the same ball—that is, its weight—the experiment gives the mass of earth in terms of that of the big sphere, and so its mean density. This experiment has often been repeated, bul I do not think it is too much to say that no a
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 202 RECENT STUDIES TX GRAVITATION. distance between them and the force G M, M, /•'. of course Cavendish's resuH gives (J. or, knowing the attraction of a big sphere on a ball, and knowing the attraction of the earth on the same ball—that is, its weight—the experiment gives the mass of earth in terms of that of the big sphere, and so its mean density. This experiment has often been repeated, bul I do not think it is too much to say that no advance was made in exactness till we conic to quite recent work. r>\ far the most remarkable recent study in gravitation is Professor Boys's beautiful form of the Cavendish experiment, a research which. Fig. '.'.—Boys's apparatus. stands out as a model in beauty of design and in exactness of execu- tion (fig. 2). Bui as Professor Boys has described his experiment already in this theater.' it is not necessary for me to more than refer to it. It is enough to say thai he made the greal discovery, obvious, perhaps, when made, thai the sensitiveness of the apparatus is increased by reducing its dimensions. He therefore decreased the scale as far as was consistent with exact measurement of the parts of the appa- ratus, using a torsion rod. itself a mirror, only 2 inches long, gold balls, in m. only 1 inch in diameter, and attracting lead masses. M M, I' Royal Institution, XIV, pari 2, L894, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
Size: 1432px × 1746px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840
