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CENTBAL SCIENTIFIC CO., CHICAGO, U. 8. A. 



No. 2772. 



No. 2782. 



2772. CENTRIFUGAL MACHINES, of acid proof construction, with basket and drip-can of porcelain. 

 Especially adapted for determining yield of sugar in refinery laboratories, and for drying 

 crystals in the experimental manufacture of chemical salts. The centrifuge is housed in a cast 

 iron frame with enclosed direct connected motor with special bearings. The cast iron drain- 

 ing chamber has an outlet at the bottom and the base is cut away to allow a collecting jar to be 

 placed beneath the outlet. Complete with rheostat for speed control, perforated porcelain 

 basket 6 inches in diameter, porcelain drip-can and interchangeable four-tube head with set of 

 10 cc plain glass tubes. Dimensions: height over all with cover closed, 22 inches; with cover 

 open, 34% inches; diameter of cast iron chamber outside, 11 inches; maximum speed permis 

 sible with" porcelain basket, 2500 r. p. m.; speed with four-tube head, 3000 r. p. m.; shipping 

 weight, 160 pounds. 



No A B C D 



A. C. D. C. 



For volts 110 220 110 220 



Each $128.70 128.70 128.70 128.70 



Note: If larger centrifuges are desired than the preceding, information will be furnished and 

 prices quoted upon receipt of specifications giving purpose for which used, size of basket or 

 number of tubes speed desired, character of driving power, etc. 



Accessories for Centrifugal Machine No. 2772. 



2774. Perforated Porcelain Basket, 6 inches in diameter 23.10 



2775. Porcelain Draining Chamber for use with No. 2774 19.80 



2776. Perforated Bronze Basket, 8 inches in diameter 113.30 



2777. Four-Tube Head, with metal shields for 10 cc tubes, with rubber cushions 13.20 



2778. Four-Tube Combination Head, with 2 metal shields for 10 cc tubes and 2 trunnion cups for Gooch 



crucibles 14.85 



2779. Hard Rubber Collars for Gooch crucibles per pair 2.75 



Note: Gooch Crucibles must be sent in to bo fitted to No. 2779, as they vary in size. 



2782. CENTRIFUGAL MACHINE, Sharpies Super-Centrifuge, gear driven, for hand power or belt 

 drive. Designed for the application of extreme speed and centrifugal force to laboratory prob- 

 lems. Operating speed of 25,000 revolutions per minute produces a separating force over 15,000 

 times as great as gravity. In addition to maximum speed and separating force it has the fur- 

 ther advantage of handling liquids continuously. 



By means of this centrifuge colloidal particles may be separated from liquids; bacteria and im- 

 purities may be removed from hot agar solutions; calcium soaps from wool fat, and oil soap and 

 fatty acids from gelatine; water from fusel oil; suspended matter from lacquers, acids, glue, 

 etc.; sulphuric acid from oil; pigments from paints and varnishes, and many other determina- 

 tions and separations made which otherwise can be effected not at all or with great difficulty. 

 Especially valuable in the chemical laboratory for slow filtering precipitates such as ferric 

 hydrate, ammonium phosphomolybdate, arsenic sulphide, etc., in routine analysis. 



