Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 37
t the equator. But theordinary balance will not reveal this difference,since the weight and the standard are both affectedequally. The spring balance, Fig. 24, shows thecondition clearly. 100. The ordinary Balance, Fig. 25, is a lever of the first class*with the two arms equal. To secure lightness… … Fig. 25. are placed at the ends, and there is an index at the centre to *See Mechanics, Section 157. B* 28 ATTKACTION. enable the observer to see slight variations. It is placed in stableequilibrium by bringing the centre of gravity a little below theknife edges, and wear is prevented by lifting…
Physics
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