Duplex Tubular Boiler
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“The Duplex is made in two equal parts, each being capable of being worked alone. Each section consists of a semicircle of upright tubes forming the boiler proper, fitted with the diaphragm a, horizontal pipes forming the furnace f, a flow pipe b and a return pipe c, and an outlet d for removing sedimentary deposits from the interior.” — Encyclopedia Britannica, 1893
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BoilersSource
The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)
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