Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 216
tute a sphere with the particle on its surface, and willtherefore attract as if all this portion were concentratedin the centre. To find what this attraction will be, let usfirst suppose the whole sphere of equal density. Let usput a, the radius of the entire sphere. r, the distance P (J of the… … Missing Page Missing Page 198 A8TR0N0MT. of a pendulum at the bottom of the Harton Colhery, andat the surface of the earth in the neighborhood. At thebottom of the mine the pendulum gained about 2^-5 perday, showing the force of gravity to be greater than at thesurface. § 3. FIGURE Airo BlAGinTUDE…
Astronomy
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