Snow, Benjamin Warner, 1860- · Madison, Wis. · leaf 206
and the pressure of the airupon the surface of the mercury inthe cistern at A causes the mercuryultimately- to stand at the height ABill the barometer tube. When theluight of this mercury column ap-proaches 76 centimeters, the vacuumin C is very nearly perfect. The reservoir D, which is to be… … Fig. 127. The Spreugel pump. 202 GASES, drops of mercury, as they fall from the tube E, again imprisonlittle columns of air, and serve as pistons to push these columnsof air do\\n the tube. The air thus carried down bubbles outthrough the mercury in the cistern at A, and with each littlebubble…
Physics
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