Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 28
ehas a hole drilled larger than the piston-rod; the Y\g. 2. lower part of conical form, ground to fit a cone onthe piston-rod; this forms the piston-valve. Thelower piece of the piston covers the end of the piston-rod, but allows it enough motion to open the valve;a series of small holes through…
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