Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 256
, but the rate at which the man would do thework would be greater; so we say he has the more power. The units of power are the foot-pound per second, and thegram-centimeter per second. These units are so small thatlarger units are commonly used. The horsepower is the onemost common in this country.… … 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…
Physics
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