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The International Exhibition: centrifugal pump by Easton, Amos, and Co. - from a photograph by the London Stereoscopic Company, 1862. The machine '...consists of an Appold's pump, placed in a case or tank of cast iron, on the top of which are fixed two high-pressure expansive condensing steam-engines, each of the nominal power of twenty horses, giving motion to the vertical spindle of the pump by means of a bevil-geared flywheel working into a pinion. The water is raised from a cast-iron tank, 12ft. deep, partly sunk in the ground, and containing 24,000 gallons, and is delivered over the edge of the upper tank in a sheet 42ft. wide and 10in. thick. The quantity raised as computed by Mr. Beardmore's hydraulic tables (the best authority on the subject) would be rather over 180 tons per minute...the water in the large tank is made use of for the purposes of condensation, so that the full power is got out of the steam...In the colony of Demerara, which is a low-lying fiat country, dependent entirely upon artificial means for keeping the land dry during the tropical rainy season, a great number of these pumps have been erected...[The pump is] especially suited for emptying docks, or for any purposes where tidal influence has to be encountered'. From "Illustrated London News", 1862. The International Exhibition: centrifugal pump by Easton, Amos, and Co..., 1862. Creator: Unknown. (KEYSTONE/HERITAGE IMAGES/THE PRINT COLLECTOR)