Elements of mechanics: for the use of colleges, academies, and high schools (1859)
Peck, William G. (William Guy), 1820-1892 · New York, A. S. Barnes & Burr · leaf 128
reads of the screw. Let AB represent the development of this helix on avertical plane, and denote by F the force applied parallel tothe base, and immediately to the weight K, to sustain itpn the plane, We shall have (Art 85), F: R : : BC : AC. ELEMENTARY MACHINES. 125 But the power is… … Fig. 87. or, P : F: : 2*r : 2«p. Combining this proportion with the preceding one, andrecollecting that AG = 2rfr, we deduce the proportion, P : B : : BG : 2«p (48.) That is, the power is to the resistance as the distance be-tween the threads is to the circumference described by thepoint of…
Mechanics
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