A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 458
.* — Howeversmooth the surface of any solid may appear tobe, there are two kinds of irregularities, viz.,mechanical and molecular. The mechanicalirregularities may be reduced by skilful work-manship, but the molecular irregularities cannotbe so reduced. The formation of a film of gas,adhering to… … FIG. 418.—Mercurialair pump. U.S. P. See Nature, Vol. 90, January 23, 1913, p. 574. 2h 434 HEAT CTTAP. The principle of the Gaede molecular air pump may be understoodby reference to Fig. 419. A cylinder A rotates clockwise in a case B,and B has two openings n and m connected by a slot. The gas…
Physics
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