59.—Screw Press.details

[Picture: 59.—Screw Press.]
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59.—Screw Press.




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A lever and an inclined plane may be combined together into a screw-press, the incluned plane being coiled up into a spiral or screw-thread (fig. 59). For every complete revolution of the lever, the weight is raised a distance equal to that between the spires of the screw-threads; hence the mechanical advantage of such a press is the circumference of the circle traversed by the force applie dat right angles to the lever, divided by the distance between succes­sive spires of the screw. Wheels and axles are usually combined by means of cogs, as is well seen in the wheel-work of a clock. (p. 138)

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34 x 27mm (1.3 x 1.1 inches)

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