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 95
it. Hence Perpetual Motion isimpossible. 198. Advantages of using Machinery.—If no addi-tional power is generated by machinery, but there is anactual loss from the friction of its parts, why is it employed ?—Because in other respects its use is attended with impor-tant advantages, among which are… … 1. Machinery enables us, with a certain amount of pow-er, by taking a longer time, to do pieces of work that wecould not otherwise do at all. Thus, a farmer with a crow-bar, asshown in Fig. 83, can move a rock whichwith his hands alone he could not stir.With the aid of two other men, he couldcarry…
Physics
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