Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 133
essure, 76 X 13.6 X980 = 1.013(10)6 dynes per square centi-meter, is sometimes taken as a unit, andis called an atmosphere. Instruments used to measure the pres-sure of the air are known as •barometers.A common form, called the siphon barom-eter, consists of a glass tube closed at theupper end. and… … Fig. 79. FOB TIX S BAB OME TEE. 123 mercury and the tube are perfectly clean and that no air isincluded. The difference of level between the free surfacesof the mercury may be read from the millimeter graduationson both legs of the tube. 90. Fortins Barometer. - devised by Fortin is shownclosed at…
Physics
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