Poynting, J. H. (John Henry), 1852-1914, Shakespear, Gilbert Arden, ed, Barlow, Guy, joint ed · Cambridge, University Press · leaf 656
xactlythe same, a pendulum being swimg above and below the surface, and thediminution in gravity above carefully determined. The experiment wascarried out with the greatest care and in a most thorough way, two pendulumsbeing swung at the same time—one above and one below—the two beinginterchanged… … A HISTORY OF THE METHODS OP WEIGHING THE EAETH 621 have been, had no outer shell existed of thickness equal to the depth of thepit, by about 1 in 14,000, so that the pull of the earth was about 14,000 timesthat of the shell. The density of the shell was determined from specimensof the rocks, and…
Poynting, J. H. (John Henry), 1852-1914 · Physics
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