CENTRAL SCIENTIFIC CO., CHICAGO, TJ. S. A. 



337 



No. 8435. 



GRINDING MACHINE, Reciprocating Type, for fine grinding, designed to replace hand grind- 

 ing with fine emery papers from No. to No. 0000, preliminary to polishing. The machine 

 consists of two carriages which move slowly in a horizontal plane with reciprocating mo- 

 tion. Each carries a glass plate 5x2 inches to which emery papers may be fastened by fil- 

 tered adhesive. Complete with four glass plates covered with special metallographic emery 

 paper of different degrees of fineness. 



S434. With tight and loose pulleys and belt shifter, for belt drive 65.00 



8435. With direct connected motor, with worm gear drive. 



No A B C D 



A.C. D.C. 



For volts 110 220 110 220 



Each 115.00 115.00 115.00 115.00 



8438. EMERY PAPERS. Metallographic, specially prepared for Metallographie purposes. 



No 0000 000 00 1 1G 



Per quire 2.30 2.00 1.80 1.75 1.70 1.70 



S44i>. HACK SAW. Power, with tension device to produce pressure on the saw during the draw cut. 

 Capacity of vise, 4x4 inches; length of blade, 12 inches; size of pulley, 13x2% inches; speed 

 of operation, 60 to 90 r.p.m.; net weight, 110 pounds; shipping weight, 120 pounds.. 20.00 

 HARDNESS TESTING APPARATUS, see general heading Hardness Testers. 

 MICROSCOPES. Metallurgical, write for information. 



PHOTOMICROGRAPHIC APPARATUS for Metallography, write for information. 

 8496. POLISHING MACHINES. Automatic Spray Type, for the final polishing of metal specimens by 

 means of levigated alumina. The machine consists of a motor mounted in a polished oak 

 cabinet, to which is attached a hard rubber horizontal polishing disk, 6 inches in diameter, 

 covered with special broadcloth. A small bronze pump, driven by the motor, pumps alumina 

 polishing liquid from a reservoir in the cabinet and forces it through the spray nozzle upon 

 the center of the polishing disk. The fineness of the spray is adjustable by a valve. The 

 reservoir can be refilled from the outside. A special stirring device prevents precipitation 

 of the alumina. Dimensions of the cabinet, 22x18 inches. Complete as described with one 

 bottle of polishing liquid. 



No A B C D 



A.C. D.C 



For volts 110 220 110 220 



Each $150.00 150.00 150.00 150.00 



S497. POLISHING CLOTH COVERS for No. 8496, cut to correct size per six 3.00 



