Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 197
ut by its own weight, the air in the bag will be rarefied, and the atmosphere will press the water into the bag. When the rod is thrust down again, the water will come out at the valve A, and fill part of the trunk. A repetition of the operation will have a sim-ilar effect; the trunk will be… … Hand Pumps. 105 simple method of describing an invention, from which greatgood in drainage of waste lands in Europe, was realized. Therewas of course a valve covering the interior orifice of the nozzleand opening outwards, to prevent the air from entering whenthe upper board was raised. This valve…
Hydraulic machinery · Pumping machinery
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