Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
the log constitutes thecylinder, and extends the whole length ofthe pump. Opeiiatiox.—As the cylinder descends9 130 HYDRA ULICS. the lower valve closes, and the water above it passes through the ui)])ervalve. The motion being reversed, reverses the valves, and dischargesthe water above the piston,… … rooms, sprinkling door-yards, etc. The upper valve is ])]aced in themouth of an air-chamber, instead of the cylinder. The object of theair-chamber is to soften the action of the pump and render the dis-charge continuous. Operation.—By raising the piston the upper valve will be closed,and the…
Physics · Astronomy
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