Open parabolic trough plant in 1912
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An example of an industrial size plant without any patent restrictions..
Fank Shuman, In 1912 he build a parabolic trough plant in the desert of Egypt near Meadi. His plant produced a total of 55 hp/41 kW steam engine that in turn pumped 6000 gallons of irrigation water per minute..
Each collector was 204 feet in length, 13 feet in width and was fitted with a mechanical tracker which kept it automatically tilted to appropriately absorb the sunlight.
Source:'The power of light: the epic story of man's quest to harness the sun by Frank Kryza'
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