Bacon, John Baptiste Ford · San Francisco, P. Elder and company · leaf 114
e used, pulsators are oftenemployed to show the operation of the pumps.A pulsator consists of a glass dome in which aquantity of air is compressed by the entranceof some oil from the main oil line. The im-pulses of the plunger in the pump will give riseto a throbbing motion of the surface of oil… … GEAR PUMP
Airplanes
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