d with a central cone of fireclay, upon the ball of glass is inflated to a cylinder, which is usually ly illustrated in Fig. 2. It consists in forcing the apex of which the tapering end of a cylinder is ulti- from four to eight feet in length, according to the de- glass through a slit in the bottom… … inder glass is, it The only suc- THE COLBURN MACHINE FOR MAKING WINDOW GLASS BY THE SHEET PROCESS. falls far short cessful effort of a machine which has been by means of which glass can be drawn out in continu- glass touches any substance directly, it can never be made to improve on this ancient…
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