Handbook for the use of electricians in the operation and care of electrical machinery and apparatus of the U. S. seacoast defenses .. (1904)
United States. War Dept · Washington, Govt. print. off. · leaf 43
34 HANDBOOK FOR ELECTRICIANS. 3. The oil pump (fig. 28), iictuated by the same lever as the air-inlet valve(fig. 30), performs thedoiible ofifice of suction on the upstroke and of forcing onthe downstroke. The suction as well as the forcing side has two check valvesin series for certainty of…
Electric machinery · Searchlights · Coast defenses
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
