Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 114
g ormetallic barometer invented in1849. (Seepage 113 for illus.)The essential principle—or discovery—is this : that a metal curved tub e—oval cross section, under pressure, tends to straighten itself according to the force exerted by the pres-sure inside. Figs. 107 and 108 show the ordinarj style… … Fig. m.
Hydraulic machinery · Pumping machinery
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