Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 59
re, enablethe operator to walk around it, so employing his strengthto the greatest advantage. The sweep, often used inmoving buildings, is another form of the same machine. Lo^-i 171. The crane is a combination of the windlass anda tackle. The derrick consists of a windlass and twotackles, one of… … Fig. 51. the cogs on the rim of one wheel work into the cogs onthe axle of the next, called a pinion. As each cog of thewheel moves one of the pinion, to determine the propor-tionate rate of revolution, divide the number of cogs onthe circumference of the wheel by the number on thepinion. In…
Physics
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