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 489
descent The pump-rods of some of the cngiuos, however, are too heavy for the engine to lift,and part of the weight has to be taken off by one lever or more, provided with counterbalance weights)placed either at the surface or in some convenient side excavation. The main pump-rod of Davys engineat…
Mechanical engineering
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