Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 250
Figure 258. — A Broom Used as aThird Class Lever. Figure 259. —TheWheel and Axle. INCLINED PLANE 239 and the weight (IF) is hung on a rope wound in the oppositedirection on the axle. When the force moves down, the weight moves up. Theaction is the same as in the lever.The radius (R) of the wheel… … Figure 260. — AnotherForm of the Wheel andAxle. The efficiency of this machine isless than that of the lever, rangingfrom 60 per cent to 99 per cent.The efficiency depends upon the bearings of the machine and upon the flexibility of the cord.Sometimes a crank is used instead of the wheel.…
Physics
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