Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 309
rd descendswhilst 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 jjk k placed above thecams and operated by them, each lever being hung on a fulcrum-pin at the rear of the frame,… … other levers k k arc 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. The same cams and levers are employed for operating the…
Mechanical engineering
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