Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . it is removed through a small door liy meansof a hoe or scraper. A series of chambers may , communicating with each other by horizontalpassages. In this case the roof of the last is partiallyopen at top to permit a draft. The black de-posited in this is the finest of all, but contains moreor less resinous and oleaginous matter. This is re-moved by heating
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . it is removed through a small door liy meansof a hoe or scraper. A series of chambers may , communicating with each other by horizontalpassages. In this case the roof of the last is partiallyopen at top to permit a draft. The black de-posited in this is the finest of all, but contains moreor less resinous and oleaginous matter. This is re-moved by heating the black to a red heat in cast-iron boxes with close covers, and maintaining it atthat temperature for two or three hours. Ivory-black, largely used as a ])igment, and bone-black, employed in refining sugars, are producedfrom animal bones. A bluish black, termed peach-black, is derivedfrom the combus-tion of peach ker-nels. Lampblack-fiirnace. A cy-lindrical chamberlined with sheepskinor canvas, and hav-ing a conical top is providedwith a cowl throughwhich the more vol-atile products ofcombustion escape,the carbon adheringto the lining of thechamber. At oneside is a smallerLamphlark Furnace (J 0 m m n n i e a t i n g. compartn\ent provided with a grate, on which a ves-sel containing the hydrocarbon, resin, coal-tar, orsimilar substance, is placed, and heated by a firebeneath. When a sufficient quantity of black has accumu-lated, a cone, having a small jierforation at its sum-mit, suspended within the main chamber, is low-ered, scraping ott the deposit accumulated on thelining, and causing it to fall to the bottom, whenceit is removed by a suitable implement. In thisstateitcontains resin-ous, bituminous, andother impuiities,wliich are driven otfby heating to rednessin a close vessel, leav-ing nearly pure char-coal in an extremelycomminuted state. brancli extendingfrom a wall or pillar,to hold a lamp. C isthe ring for the lamp-bowl, if the reflectorwhich
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
