. The Family tutor . Fig. of the earth second at the pole is 16-12 feet; but at the equator it is16-01 feet. This arises from the circumstance that theearth is not a perfect sphere, its polar diameter beingshorter than its equitorial, and, therefore, bodies at the £poles are nearer to its centre than they are at theequator. Thus, in Fig. dQ, let N S represent the globeof the earth, N and S being the north and south poles,respectively. Owing to its polar being shorter than itsequatorial diameter, bodies situated at different pointson the surface may be at very different distances fromt
. The Family tutor . Fig. of the earth second at the pole is 16-12 feet; but at the equator it is16-01 feet. This arises from the circumstance that theearth is not a perfect sphere, its polar diameter beingshorter than its equitorial, and, therefore, bodies at the £poles are nearer to its centre than they are at theequator. Thus, in Fig. dQ, let N S represent the globeof the earth, N and S being the north and south poles,respectively. Owing to its polar being shorter than itsequatorial diameter, bodies situated at different pointson the surface may be at very different distances fromthe centre, and the force of gravity exerted upon themmay be correspondingly very CHAPTER XX. MOTION OF INCLINED PLANES. Case of a Horizontal^ a Vertical, and an Inclined Plane.— Weight expended partly in pro-ducing pressure and partly motion.—Law of Descent down Inclined Planes.—Systems ofPlanes.—Ascent up Planes.—Parabolic theory of Projectiles.—Disturbing agency of theAtmosphere.—Resistance to Cannon shot.—Ricochet.—Ballistic a spherical body is placed on a plane set horizontally, its whole gravitation 186 NATURAL PHILOSOPHY.
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