Definitions
from The Century Dictionary.
- noun In a steam-engine, a form of bell-crank lever serving to convert rotary motion into reciprocating motion, for operating a pump-piston.
Etymologies
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Examples
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There are two ropes from the wheel-shaft to a counter-shaft, and four ropes to the fly-wheel shaft, on which is the pinion driving the spur-wheel attached to the pitman of the pump-bob.
Scientific American Supplement, No. 455, September 20, 1884 Various
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The water-wheel moved only in one direction; the pinion on the wheel-shaft drove the spur-wheel, to which the pitman of the pump-bob was attached.
Scientific American Supplement, No. 455, September 20, 1884 Various
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