CENTRAL SCIENTIFIC CO., CHICAGO. TT. 8. A. 



143 



2784. 



2785. 



2786. 

 2787. 

 2788. 

 2790. 



No. 2784. 



No. 2785. 



No. 2790. 



CENTRIFUGAL MACHINE, Sharpies Super-Centrifuge, Continued. 



The machine consists essentially of an iron frame cast in one piece. Within this is suspended a 

 seamless tubular tin lined steel bowl, by means of a flexible spindle, with a cone at its upper 

 end, running on ball bearings. By means of the cone bearings wear is automatically taken up. 

 At the lower end of the bowl is a guide or drag which keeps the bowl centered and absorbs 

 vibrations. Parts are easily removed for cleaning and can be readily and economically replaced 

 when worn. 



The liquid comes in contact only with tinned surfaces except in passing through the feed nozzle, 

 which is of nickel; consequently weak acids or alkalies may be handled continuously or stronger 

 reagents for brief periods. If desired the machine parts may be obtained plated with gold, 

 silver, or platinum, at an additional charge. 



Height of machine, 24 inches. Size of base, 10^x8 inches. 



Weight, 50 pounds. Maximum speed of gear driven machine, 



Diameter of inner bowl, 2 inches. 25,000 r. p. m. 



Capacity of bowl, 250 cc. Power required to operate, % h. "p. 



Complete with tin lined bowl, geared crank and pulley, 2x10 inches, for hand or belt drive $125.00 



CENTRIFUGAL MACHINE, Sharpies, same as No. 2782, but with turbine wheel attached to 

 shaft for driving with steam or compressed air at 20 pounds pressure. With a pressure of 25 

 pounds, a maximum speed of 40,000 r. p. m. is attained, producing a centrifugal force of over 

 40,000 times gravity. Air consumption, 40 cubic feet per minute; steam consumption, 60 

 pounds of water per hour. Complete with speed indicator 125.00 



Extra Inner Bowl, of steel nickel-plated, for use in clarifying or filtering liquids in quantities 

 not exceeding 50 cc. It is not continuous in action. Consists of two parts, threaded to screw 

 together. Liquid is placed in lower part, the top screwed on, the whole bowl is then placed 

 within the regular super-centrifuge bowl. When the bowl revolves, the liquid is instantly 

 drawn into the upper chamber, where the solids are packed against the outer-wall. The liquid 

 again collects in the lower part when the machine is stopped, leaving a perfectly clear filtrate. 

 Quantitative results may be secured with proper care. Especially valuable in handling serums 

 and bouillons in bacteriological work 8.00 



Extra Inner Bowl, same as No. 2785, but silver-plated 12.00 



Extra Inner Bowl, same as No. 2785, but gold-plated 15.00 



Extra Inner Bowl, same as No. 2785, but platinum-plated Price quoted upon application. 



CENTRIFUGE TUBE BALANCE, for use in selecting glass centrifugf tubes whose weights are 

 approximately equal, in order to prevent centrifuge bearings from wearing unevenly. It will 

 take either 15 ce or 50 cc standard tubes. Finished in black enamel and nickel-plate. Complete 

 with two aluminum shields and two 15 cc plain glass tubes, mounted on enameled iron base with 

 robber feet 18.00 



