Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 118
ial barometer ent of atmospheric pressure. and a correction when it varies, to make The mercurial barometer is subject to it agree. fluctuations due to temperature, but When the barometer is employed for these are easily allowed for as the possi- the purposes of meteorology only, the ble changes… … Fig. 2. series of hourly observations conducted Variations of the Barometer. — The for some time. The results show two variations observed in the pressure maxima occurring from 9 to 11 a.m. and of the air may be divided into two from 9 to 11 p.m., and two minima occur- classes — viz., periodical…
Engineering
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