Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 257
Figure 273. — The Piano Stool Isan Application of the Screw. \r Figure 274. — TheWood Screw. Figure 275. — The Bolt and Nut Isan Application of the Screw. 246 MACHINES If a girl weighs 120 pounds and climbs the stairs from one floor to thenext, a distance of 15 ft., in 30 seconds, she does 120 X 15… … 291. Power Delivered by Pulleys. — It is often desirableto know the power necessary to run certain appliances in the home, such, for example,as the sewing-machine,the vacuum cleaner, thewashing-machine, foodchopper, bread mixer,etc. Most of these areeither run by pulleysdriven by belts or bygears,…
Physics
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