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 . ected by a rope with a triggerat the upper part of the frame,by which the hammer is heldin an elevated position. Acartridge is placed in the pile-cap c, and the piston allowedto drop, compressing the aircontained in the cap c suffi-ciently to ignite a cartridgeplaced therein. The explosiontluows up the hammer, whichagain dro]is by its gravity, andso on. The powd
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 . ected by a rope with a triggerat the upper part of the frame,by which the hammer is heldin an elevated position. Acartridge is placed in the pile-cap c, and the piston allowedto drop, compressing the aircontained in the cap c suffi-ciently to ignite a cartridgeplaced therein. The explosiontluows up the hammer, whichagain dro]is by its gravity, andso on. The powder used iscomposed of H parts chlorate ?)==• [[? j ig^of potash and 1 bituminous coal, finely pulverized and in- timately mixed. The chargeis very small, one third of anounce sufficing to operate a hammer of 675 ]ioundsweight. The piston, at the upper part of the ma-chine, enters into the cavity in a and acts as a buffer,preventing injury to the luacliine and assisting thedownward movement of the hammer. Gunpow-der-niill. Fig. 2346 shows an ar-rangement by which several gunpowder rolling-millsare driven from a water-wheel a by bevel and spur-gears b b c c. The cast-iron or stone rolling-cylinders Fig. 2346. Gunpoicder-Han. Gunpowdfr-MiU. GUNPOWDER-PRESS. 1042 GUNTERS SCALE. c c i-fvolve on a horizontal axis whicli is carriedaround by a vertical sliaft within tlie circulartrongh d, into wliich a charge, usually 75 or 150pounds, of the incorporated materials from therolling barrel has been placetl. The rollers are setin motion, slowly at first, and afterwards morerapidly, and kept going three hours for a charge of150 pounds, or for a less ijuautity a proportionatelyless time, a little water being added to preventdanger of explosion should tlie materials become toodry. A scraper follows each roller to keep the com-position exposed to the action of the rollers. At theend of this time the mass has become thoroughlyincorporated, is of a brownish red color, and istermed mi/l-ctdr. S
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