A laboratory manual in physics, to accompany Black and Davis' "Practical physics for secondary schools," (1913)
Black, Newton Henry, 1874- [from old catalog] · New York, The Macmillan company · leaf 40
es, is evidently the atmosphericpressure. This is obtained by reading thebarometer and is usually expressed as a certainnumber of centimeters of mercury. When,however, the mercury in the open tube (J.)stands at a lower level than that in the closedtube (5), then the air in the tube is under… … Fig. 14 26 LABORATORY MANUAL tube is higher than it is in the closed tube, then the air isunder more than atmospheric pressure and the pressure isequal to the barometric pressure plus the difference in levels.By merely shifting the relative positions of the two tubes(or in the J-form of apparatus…
Physics
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