CENTRAL SCIENTIFIC CO., CHICAGO, U. a A. 



303 



No. 7424. 



No. 7460. 



No. 7468. 



741:2. 



7424. 



14S8. 



-- '. 



746S. 



74^4. 



For GOUGES see Chisels. 



GRINDSTONES. Selected Berea grindstones, rubbed smooth, mounted in a east iron trough, with 

 pressed steel base, steel shaft and steel ball bearings. Shipped knocked down. 



Diameter, inches 6 10 



Each $2.90 3.60 



GRINDER, with clamp for fastening to table 2 inches thick or less. High quality abrasive wheel 

 4 inches in diameter, 1 inch face; gears enclosed for protection '. 7.00 



HACK-SAWS, see Saws. 



HAEMATOLOGY APPARATUS, see Blood Testing Apparatus. 



HAMMERS, of cast steel, wedge shaped, for breaking ores. 



Xo A B 



Weight, ounces 7 16 



Each 85 1.00 



HAMMER. Blowpipe, Planner's, with wooden handle 45 



HAMMERS, Claw, cast steeL 



No A B 



Weight, ounces 7 13 



Each -. 1.15 1-25 



HAMMER, Prospecting Pick, of cast steel, square head with flat face. Pick point of hardened 



steel. Weight I 1 * pounds 24JO 



HAND TALLY, see Counter No. 3318. 



HARDNESS TESTERS 



For a full discussion of methods of measuring hardness of metals, see Technologic Paper No. 11 

 of the United States Bureau of Standards. 



HARDNESS TESTER. Brinell Ball Type, for maximum pressure of 3,000 kilograms, for deter- 

 mining comparative hardness by the Brinell ball indentation methodl This instrument is con- 

 sidered the standard for hardness tests and is widely used by steel manufacturers and users 

 throughout the world. The machine is of the hydraulic type, using glycerine as the pressure 

 medium. The press is so constructed that no air can leak in behind the plunger. A special 

 feature of this method is the automatic depth gage by which the depth of tte indentation 

 may be read directly without calculation and the corresponding Brinell number obtained from 

 a table supplied with each machine. Shipping weight. 700 pounds. Complete as described, 

 filled with glycerine, but without Automatic Depth Gage 315.00 



