Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 260
etermine the average densityof the whole Earth ? To determine the density of the Earth we must find hoic much matterit must contain in order to attract bodies on its surface with forcesequal to their observed weights, that is, with such intensity that at theequator a body shall fall nearly five… … THE EARTH. 239 We may measure the attraction of a body of known mass in thefollowing ingenious way. In Fig. 151 H1KL is a cube of lead 1 metreon each edge. Two holes are boredthrough the cube at DF and EG-A pair of scales ABC bas its scale-pans HE connected by fine wiresto other scale-pans EG,…
Astronomy
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