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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
at to govern the ingress of air, and cause it to pass through a uniform depth of liquid. Levi L. Hill, 1859, reissued 1863, modified the richness by inlet of air, and had a double bellows for equable blast. F. S. Pease had a separate tube to condense an excess of liquid. Lowback, 1860, heated the air. Matters remained in this condition until the discovery of petroleum; the first notice of petroleum benzine was in a Boston paper, September, 1860. John A. Bassett, by patent March 2, 1862, developed the use of the petroleum liquid, which gives the carburetor its practical value, the gas-tar products being expensive and difficult to manage. Levi Stevens, December 20, 1864, passed the air through a shower of the liquid, which was dropped into the vaporizer in measured quantities. Irwin introduced a feature (April 11, 1865) founded on the fact that the hydrocarbon vapor conferred greater gravity upon the air, so that the weight of the carbureted air forced itself to th