A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 99
e solid arid the hollow screw would in most cases requiren-reat additional power to produce any considerable effect. Thistherefore renders the application of a lever necessary to constitutethe screw an effective machine. The lever may be added to thesolid screw, to turn it within a fixed hollow…
Physics
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