A descriptive and historical account of hydraulic and other machines for raising water (1850)
Ewbank, Thomas, 1792-1870 · New York, Bangs, Platt, & Co. · leaf 250
: No. 91 is a figure of it. The rod of the lower sucker slidesthrough the centre of the upper one; and also through its valve, whichis a spherical or hemispherical piece of brass, placed loosely over its seatand to which the rod acts as a guide. The upper parts of the rods ter-minate in racks,… … No. 91. Double Piston Pumpt Chap. 7.] Working Ship Pumps by Ropes. 227 one end of the shaft of the cog wheel; over this a rope is passed andcrossed below, to which any number of men, on each side, may applytheir strength. Both parties pull the rope towards them by turns, andthereby impart the…
Pumping machinery
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