Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 102
height of the mercury in the tubecauses a difference of level in the cistern,which is the zero of the scale. Since thevariation in the height of the mercury issmall, the scale is* omitted except near thetop. A thermometer at the side of the tubeindicates the temperature. Fig. 118. *A vernier is… … Fig. 119. 318. Fortins Barometer is used inall accurate work. Fig. 119. It con-sists of a tube and cistern, as in thecistern barometer, but the bottom ofthe cistern is made of leather, so thatit can be raised or lowered by a screw C.An ivory point a is placed at the topof the mercury in the…
Physics
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