Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 212
brations which DENSITY OF TUK EARTH. 193 require several minutes. At lengtli it comes to rest in aposition somewliat different from its original one. Thisposition and the times of vibration are all carefully noted.Then the table T is turned nearly end for end, so that oneweight W shall be between… … FiG. 65. rections, giving a result from which accidental errors willbe very nearly eliminated. A third method of determining the density of the earthis founded on observations of the change in the intensityof gravity as we descend below the surface into deepmines. The principles on which this…
Astronomy
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