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![[Picture: 58.—Screw Lever Pointer.]](https://www.fromoldbooks.org/Lodge-ElementaryMechanics/pages/58-screw-lever-pointer/../../tn/58-screw-lever-pointer-q75-500x496.jpg "[Picture: 58.—Screw Lever Pointer.]")
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139. A combination of levers is sometimes used, but more often for the purpose of magnifying small motions than for exerting great force; that is, for increasing the factor s in the product work at the expense of the factor F. In fig. 58 the motion of the screw is magnified, the pointer describing a considerable arc for one turn of the screw. (p. 138)
