The outlines of physics: an elementary text-book (1897)
Nichols, E. L. (Edward Leamington), 1854-1937 · New York, The Macmillan Company; London, Macmillan & Co., Ltd. · leaf 155
ionthat the column, sustained above the general level of thecistern, precisely balanced the atmospheric pressure. Thisoccurs, as indicated above, when the column has a verticalheight of about 76 cm. The amount varies slightly in agiven locality from time to time through a range of sev-eral… … Pig. 120. 127. Construction of the Barometer. — In order that Tor-ricellis apparatus may serve as an instrument of precision,certain conditions have to be very carefully fulfilled. (1) The mercury must be pure and clean. (2) The vacuum above the mercury must be as nearlyas possible complete; i.e.…
Physics
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