. The principles of physics. rm rate of one inch for every 900 feet ofascent. If a mercurial barometer stand at 760 mm. on the floor, thesame barometer on the top of a table 1 m. high should standat a hight of mm., a change scarcely perceptible. Theaneroid is, however, sometimes made so sensitive that thechange of pressure experienced in this short distance is ren-dered quite perceptible. The shading in Fig. 132 is intended to indicate roughly thevariation in the density of the air at different elevations abovesea-level. The figures in the left margin show the hight inmiles; those in th
. The principles of physics. rm rate of one inch for every 900 feet ofascent. If a mercurial barometer stand at 760 mm. on the floor, thesame barometer on the top of a table 1 m. high should standat a hight of mm., a change scarcely perceptible. Theaneroid is, however, sometimes made so sensitive that thechange of pressure experienced in this short distance is ren-dered quite perceptible. The shading in Fig. 132 is intended to indicate roughly thevariation in the density of the air at different elevations abovesea-level. The figures in the left margin show the hight inmiles; those in the first column on the right, the correspondingaverage hight of the mercurial column in inches; and thosein the extreme right, the density of the air compared with itsdensity at sea-level. / It is calculated that if an opening could be made in theearth 35 miles in depth below the sea-level, the density of the 162 MOLAK DYNAMICS. air at the bottom would be 1,000 times that at sea-level, sothat water would float in it. 35- 6 5i. 15- 10- T<rTnF STSWBTS
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
