Five hundred and seven mechanical movements (1903)
Brown, Henry T. [from old catalog] · New York, Brown & Seward · leaf 125
with someporous material. Column of mercury in longerleg, from which the air has been extracted, is j held up by the pressure of air on the surface ofthat in the shorter leg, and rises or falls as the\ pressure of the atmosphere varies. The old-I fashioned weather-glass is composed of a similartube… … 503 n m^a \ ^ 50i itmnTTTTTinl j H %n E r jJIC ^ V D 5(?J
Mechanical movements
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