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Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
ugh it, either upward or downward, as the case may be, to the telescope of the collimator, which, in the vertical instrument, is mounted with its axis coincident with the axis of the ring. The adjustment consists in bringing the cross-wires of the two telescopes to a mutual intersection by the screw movement of the circle. G. chambers. Col′lish. （Shoemaking.) A tool to polish the edge of a sole. Col-lo′di-o-chlo′ride Process. A photographic printing process invented by George H. Simpson, editor of the Photographic News, about 1863. It consists in holding in suspension a precipitate of chloride of silver in collodion, which is flowed upon glass or paper — in a manner similar to preparing a plate for the negative process — and dried in the dark. The sensitive surface so produced blackens on exposure to light, and will consequently give a picture under a photographic negative. An excess of free nitrate of silver is necessary to impart sensitiveness; an addition o