Merchant, F. W. (Francis Walter), 1855-1937, Fessenden, Cortez, b. 1852 · Toronto : Copp, Clark · leaf 131
s to be removed. A piston D, in which there is a valveopening upward, is worked in the barrel by a rod whichpasses through the air-tight collar at the top of thebarrel. At A and B, the ends of the barrel, are valvesopening upward. A gauge G for testing the extent ofthe exhaustion is sometimes… … air escapes, while a part of the air in the receiver R flowsthrough the valve B and occupies the vacuum formedbelow D. When the piston begins to descend, the valvesA and B are closed (Fig. 90), and the air in DB flows up PROPERTIES AND LAWS OF GASES. 123 through the valve in D. Thus at each double…
Physics
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