Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 72
distance from the ground. Upon the upper surface of these posts is placed horizontally, and se-cured strongly, a piece of timber b, say of oak, about twenty inches wide on its upper surface, and fourinches thick. This we term the bed of the machine. Two straight cast-iron bars c, about two…
Mechanical engineering
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