Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 199
s an endless doubleband of woolen cloth, passing over two rollers, not here shown. It is driven with avelocity of not less than a thousand feet per minute; when thewater contained between the two surfaces is carried up and dis-charged as it passes over the upper roller, by the pressure ofthe band.… … Fig. 171. Fig. 172. Hand Pumps. 201 Spray Pump. Fig. 173 exhibits a carefully designed pampmade to spray trees, plants, etc. All the working parts are ofbrass, the v^alves are metal; the air chamber is made of gal-vanized iron or copper and has large capacity. It will hoklsufficient compressed air…
Hydraulic machinery · Pumping machinery
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