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 483
en- descent. The pump-rods of some of the engines, 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… … Scalk.—j incli=l foot. pump, and the greater part of the remaining 90 is balanced by weighted levers. The main pump-rodis usually composed of balks of Jlemel timber, and at intervals down the sides of the shaft projectingpieces are bolted on, which catch upon suitable timbers let into the sides of…
Mechanical engineering · Mechanics · Engineering
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