Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 74
ncipleof a door intended to open or close a passage. If you walkagainst a door on one side, it opens and allows you to pass ; butif you walk against it on the other side, it closes the passage,and stops your progress. Suppose the piston to be in the actof descending. The compression of the air in B… … 58 t>YXA3*IICS. to fill the vacuum that is formed between the bottom of thebarrel and the piston, closes the valve s. But as soon as avacuum is foi-med above t, and the downward pressure on thevalve removed, the air in R expands, opens the valve t, and fillsthe space in B that would otherwise be…
Physics
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