Excerpt from Rudimentary Treatise on the Construction of Cranes and Machinery

The subject of this Treatise is the construction and use of machines which diminish toil, and facilitate and lessen la bour without superseding it, enabling men to perform what they could not accomplish without such aid.

Deprived of mechanical power, a man's' force is limited to his muscular strength, of which he has but little, in proportion to his bulk and weight, when compared with other animals, his disposable mechanical force, when daily exerted for ten hours, being only about one-tenth of his weight.

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