Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 179
to the fulcrum a; and this part of the beam is shod with an iron plate, full of small centre-holes for the brace. The weight is raised by the second lever c d, the two being united by a chain, anda light chain or rope is also suspended from d, to be within reach of the one or two men engaged… … The inconveniences in this machine are, that the upper point of the brace moves in an arc instead ofa right line; the limited path when strong pressures are used, which makes it necessaiy to shift thefulcrum a; and also the necessity for readjusting the work under the drill for each different…
Mechanical engineering · Mechanics · Engineering
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