Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)
Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 55
52 JRICTION OR ATTRITION. … Thus, if the threads on the cy-linder a b be made a quarterof an inch apart, and the nutD be turned by the handle orlever c u, which is two feetlong; then as the power of thescrew is relatively as the cir-cumference is to the distance ofthe threads, this diameter ofthe power will be twice c o or48…
Physics
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