Cooke, Josiah Parsons, 1827-1894 · Boston, Little, Brown and Company · leaf 306
gure. At the mo-ment of observation, we lower the screw by turning it on its axis\intil the lower point just touches the mercury. This contact canbe obtained with the most perfect precision, for until it takes placethe observer sees at the same time the point and its image reflect-ed by the… … i mr% !\ !|l|li ii 4 p Hg. 260. we measure the distance, with the cathetometer, between theupper surface of the mercury in the tube and the upper point ofthe screw, and we have only to add to this length the knownlength of the screw. Of all barometers this one is the simplest,and of all methods of…
Matter · Heat
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