Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 129
jettube in the mannershown, and then suckingthe air through the valve,a partial vacuum may bequickly formed in thetube. The vacuum willbe retained by the valve,so that when the valve isdisconnected from the jettube, while the latter is Mouth Vacuum Apparatus. • i • „*„„ +u-- ^^ immersed in water,… … ANCIENT INVENTIONS OPERATED BY AIR PRESSURE. More than two thousand years ago, Hero (or Heron),a philosopher and mathematician of Alexandria, inventedthe fountain shown in the annexed enp-raving-. This device. GASES. 107 Fig. iio<
Physics · Lantern projection · Electric apparatus and appliances
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