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Knight's Mechanical Encyclopedia (ed. Knight) 4 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
d the float operating the valve of the admission pipe for the liquid. Martin, 1858, added a lamp, to expedite the vaporization. David, in 1859, used a bulb of displacement, to preserve a constant level, instead of an automatic valve of admission; and this was so arranged as to maintain a uniform hight, although the liquid varied in density as evaporation proceeded. Ashcroft, 1857, had a float 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,
Knight's Mechanical Encyclopedia (ed. Knight), H. (search)
Hight-staff. （Shipbuilding.) A rod having marked upon it the hights above the keel of all the frames at the beam-line of the ship. High-warp loom. （Weaving.) A tapestry loom in which the warp-frame is vertical and the weaver works standing, thus being able to constantly inspect his work as it proceeds, an advantage which he does not possess in the bass-lisse or low-warp tapestry loom in which the warp is horizontal. Hill′o-type. （Photography.) A process invented by L. L. Hill, of Westkill, New York, and much debated in the photographic journals of twenty years ago and since. He claimed — See photographic Art-Journal, October, 1852--to have discovered a method of heliotyping the colors of objects truthfully, brilliantly, and imperishably. The correspondence is voluminous, some of it acrimonious; the colors certified to have been produced heliotypically in the pictures are rosy, red, blue, green, orange, violet, buff. The process is not explained in these a