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 . he heatpasses thro\igh acentral opening tothe oven containingtheglass-pots, whichare placed closelytogether for econ-omy of space. Thejiots are introducedthrough a fiont o)ien-ing which ia thenbricked u]i. Theworking-holes arebetween the pillarsof the structure. Aflue conducts theheat to the anneal-ing-stove, exterior to which is usually a diying-kiln,not shown
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 . he heatpasses thro\igh acentral opening tothe oven containingtheglass-pots, whichare placed closelytogether for econ-omy of space. Thejiots are introducedthrough a fiont o)ien-ing which ia thenbricked u]i. Theworking-holes arebetween the pillarsof the structure. Aflue conducts theheat to the anneal-ing-stove, exterior to which is usually a diying-kiln,not shown in the figure, and there are adjoining stovescalled archs for drying and annealing new pots. G-lass-gaU. Scum on the , in the Glass Grinding and Polish-ing. Plate-glassfrom the table recpiires grinding and polishing,which is peifoiTOed by machinery. The under jilateis imbedded in stucco on a solid table, and theupper one in a cast-iron frame, which has a motionaround its own center and around a point on thelower plate. The latter is on a movable table, andhas a slow njotion in the direction of its length andits breadth. Jloistened sand is applied between thetwo. Afterwards different grades of emerv are Bohemian Furnace. GLASS GRINDING AND POLISHING. 980 GLASS-MOLD. Tile polishing is elTected l)y rubliers of hat felt orIcatluT, with a jiaste of colcothar and , a imtty, oxide of tin, is used. Fij;. 2241 illustrates a machine for grinding ;thiiig tlu^ [ilates to a true and even surface]ire|iaratory to linally polishing them. Tlie dotted lines indicate the framework of themachine supporting the bed a, to which a sheet ofglass is cemented. Two bevel wheels b b rotate theaxis c, which carries the crank d attached to oneside of the movable table c, imparting to it a circularmotion about the point /, where the radius-rod g is
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
