The machinist and tool maker's instructor, containing an easy method of calculating and laying out difficult work in the machine shop .. (1896)
Genung, Edward. [from old catalog] · New York [Press of J. B. Savage, Cleveland] · leaf 214
pounds would be a safe estimate in thiscase, including friction, to lift the weight. It must be remembered that if the weight is in any otherthan a horizontal position from the fulcrum on which it movesthat the distance A B, will be equal to the cosine of theangle, as shown in the figure. Thus,… … We have a barrel weighing 300 pounds, (Fig. 7), and wewant to roll it into a wagon that is 45 inches high by usinga plank (A) which is ten feet long; what force will be necessaryto roll it up the inclined plane as shown when the pull is par-allel with the line A? 300X45=13500 and 13500-^120 (10…
Machinery
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