A spade may be made of any size, and if the same number of strokes be made in the hour, the requisite exertion will vary nearly as the cube of the length of the blade. (William Stanley Jevons)

A spade may be made of any size, and if the same number of strokes be made in the hour, the requisite exertion will vary nearly as the cube of the length of the blade.

William Stanley Jevons

Related topics

blade cube exertion hour length number requisite size spade vary

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