Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 595
. It is apparent that the action of the sucking-pumpmust be very irregular, and that it is only during theascent of the piston that it produces any useful effect; sucking-pumpduring the descent of the piston, the force is scarcely ^.S0Texerted at all, not more than is necessary to overcomethe… … except that the barrel and FiS- 345- sleeping-valve E are placedat the bottom of the pipe, andsome distance below the sur-face of the water L L in thereservoir; the piston may ormay not be below this samesurface when at the lowestpoint of its play. The pis-ton and sleeping valves openupward.…
Mechanics · Acoustics · Optics
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