A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 122
is sometimes made to act on teeth cut in the Fig. 125. circumference of a wheel. In thiscase, the only motiDn of the screwis round its axis. The winch beingturned, the threads of the screwcatch the teeth of the wheel andmove it forward. As fast as onetooth passes out of reach, anotheris caught;… … THE ENDLESS SCREW. EXAMPLES FOR PRACTICE. 1. {See §204.) A lever of the first kind is 20 inches in length : the long armis 15 inches; the short arm, 5. How great a power will balance a weightof 112 pounds ? With the same lever, how great a weight will a powerof 50 pounds balance ? 2; A farmer, in…
Physics
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