. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. TEXTILE AND MANUFACTURING DEVICES, ETC. 321 831. DIAMOND CRUSHER AND MORTAR. Diamondsfor the use of the lapidary are crushed in a mortar, which consists of a cyhndrical box, a, and a pestle, h, both madeof hardened steel. A small rough diamond isplaced in the mortar,
. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. TEXTILE AND MANUFACTURING DEVICES, ETC. 321 831. DIAMOND CRUSHER AND MORTAR. Diamondsfor the use of the lapidary are crushed in a mortar, which consists of a cyhndrical box, a, and a pestle, h, both madeof hardened steel. A small rough diamond isplaced in the mortar, and the pestle drivendown by a hammer. The pieces of brokendiamond are examined for the detection offragments suitable for gravers, drills, and etch-ing points. The remainder is crushed to animpalpable powder by several hours continuedwork, rotating the pestle between blows. When sufficient fineness is not attained by the mortar, the dust may beground between the concave and convex surfaces, c, d, of a hardened steelmill, a little oil being added to the dust. The particles will grind Section of the grinding mill. 833. DIAMOND HAND TOOLS AND DRILLS. In Fig. a, aare front and side views of diamond chisels used in turning rubies for watch-jeweling ; ^ is a diamond drill for mak-ing the hole in the ruby plate ; (/ is a tool ofsteel wire to be used with diamond dust indrilling jewels ; e, / are two views of a tri-angular fragment of diamond mounted fordrilling china or porcelain ; ^ is a squarestone mounted for the same purpose ; h is ametallic tube for drilling annular holes injewels with diamond dust; i is a diamondpoint mounted for etching or ruling in en-graving ; /, k are diamonds mounted for ruling graduations of mathe-matical instruments. 834. COMBINATION PRESS for fruit,lard, or a sausage stuffer. For fruit, thegauze wire basket and strainer diaphragmsare used. The piston, screw spindle, andgear are attached to the swiveling yokeand leave the cylinder clear f
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Keywords: ., bookauthorhiscoxga, bookcentury1900, bookdecade1910, bookyear1910
