Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 33
theirmotions. Terrestrial Gravitation, with its result, the fallof bodies, is a special case. 83. Plumb Line. The direction in which a body falls,that is the direction in which gravity acts, is a vertical line,and the line prolonged to the heavens marks the Zenith.It is usually determined by the… … Fig. 15. allowed to come to rest. Sucha line points to the centre ofthe earth. For this reason plumb lines atdifferent points as V and V arenot parallel, while they may evenbe at right angles to each other, asthe horizontal and perpendicularplumb lines of Fig. 15. 84. A plane perpendicularto the…
Physics
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