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 479
tforms are fastened, so that one or two men may stand on each: these plat-forms are from 10 to 20 feet apart, to which the lift of the rod corresponds. Theopposite platforms meet at the dead points of the up and down motion, and at thisculmination the men step from ono platform over to the other,… … ELEVATOR. 471 of the rods, and the change of place may he accomplished with perfect safety hy the men. The motionof these rods may he accomplished by means of cog-wheels, or by means of cranks or levers. The rods may in the mean time serve as pump-rods, driving a set of pumps at the bottom of the…
Mechanical engineering
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