![[Picture: 61.—Wheel and axle comined with a screw.]](https://www.fromoldbooks.org/Lodge-ElementaryMechanics/pages/61-Wheel-axle-and-screw/61-Wheel-axle-and-screw-q85-1167x1210.jpg "[Picture: 61.—Wheel and axle comined with a screw.]")
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A wheel and axle may be combined with a screw, as shewn in the contrivance of fig. 61. When the handle is turned, the screw-thread on its axle sends the cog-wheel forward one tooth for every revolution. Such a screw, which itself does not advance in a nute, but which merely rotates in ordinary bearings, is called an ‘endless’ screw. (pp. 139, 140)
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