International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 349
60 X -v. .r = 480 160 3 inches, the distance that JF {b) 20 X 24:moves. Ans. (^) 3 : 24 = 1 : 8, or the ratio is 1 : 8. Ans. 928. The law which governs the straight lever alsogoverns the bent lever; but care must be taken to deter-mine the true lengths of the lever arms, which are in everycase the… … Fig. 139. Fig. 140. 929. The Compound Lever.—A compound lever is a series of single levers arranged in such a manner that 338 ELEMENTARY MECHANICS. when a force is applicl to the first it is coiiimunicated tothe second, and from this to the third, and so on. Fig. 141 shows a compound lever. It will…
Railroad engineering
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