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 307
descendswliilst the other ascends; and the form and position of the cams should be such that one trap-boardshall begin to ascend as the other begins to descend. There are four levers// h k placed above thecams and operated by them, each lever being hung on a fulcrura-pin at the rear of the frame,… … other levers h h are in like manner and for the same purpose connected to the other trap-board C. bysimilar rods n n. In this way it will be perceived that the required alternate up and down motionsare given to the two trap-boards. Tlie same cams and levers are employed for operating the…
Mechanical engineering · Mechanics · Engineering
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