A text book of elementary mechanics, for the use of colleges and schools (1881)
Dana, Edward Salisbury, 1849-1935 · New York, J. Wiley & sons · leaf 246
wheel,which is grooved, passes a rope, and at one end of thisthe power acts. Sometimes two wheels are placed sideby side, as in Fig. 157. The necessity of making the wheel turn on its axisarises from the friction, which is very much diminishedin this way; except for this, fixed pegs would answer…
Mechanics
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