Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 44
ton drawnback, the atmosphere drives the liquid into the cylinder; whenceit is expelled through the same orifice by pushing the pistondown: in the former case the syringe acts as a sucking pump:in the latter as a forcing one. They are formed of silver, brass,pewter, glass, and sometimes of wood.… … WELLS. Long before pumpingdevices were conceived, wellsexisted as the invention ofprehistoric man. Herewithis a sectional view of JosephsWell to be seen at the pres-ent time at Cairo, Egypt.Scientists think it the pro-duction of the same peoplethat built the pyramids andthe unrivaled monumentsof…
Hydraulic machinery · Pumping machinery
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