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 . 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 line
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 . 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. Glass-Poljskhig Machine. pivoted ; the beil a also has a .slow longitudinal re-ciprocatijig movement imparled from a bar lower part of the table c is faced with slate, towhich a sheet of glass is cemented. Clean sharpsand and c< emery are used for giinding, andfiner emeries for smoothing ; the apparatus beingcarefully washed at each change from coarser tofiner material. By tlie combined rotary and longitudinal move-ment the abradants are caused to operate with equalenergy on every (loint of the plates. Weights arcplaced upon the back of the table e to insure suffi-cient piessnre. The final polishing is completed by leather-coveredFig. 224a.
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
