Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 141
tween the threads of the scretv. In actual practicethe friction m such an arrangement is alwaysvery great, so that the effort exerted mustalways be considerably greater than that givenby equation 7. The common jackscrew justdescribed (and used chiefly for raising build-ings), the letter press (Fig.…
Physics
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