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



135 



2547. 



2548. 

 2549. 



2550. 

 2551. 

 2552. 

 2553. 



2554. 

 2555. 



2557. 

 2558. 

 2559. 



get 



No. 2548. No. 2551. No. 2553. No. 2555. No. 2556. 



No. 2570. 



PLAIN URINE TUBES, 15 cc each $0.20 



per dozen 2.00 



GRADUATED TUBE, length 4^ inches, outside diameter ii^ c inch, graduated to 10 ec. . . .40 

 PLAIN TUBE, same as No. 2548, but ungraduated, length of tube 4% inches, outside diametef 



ll/ 10 inch 



.20 



ALUMINUM SHIELD for 15 ce tubes 30 



GOETZ TUBE for phosphorus determinations, with graduated tip 1.10 



METAL SHIELD for carrying No. 2551 Goetz Tube 1.10 



CEMENT TUBE, with 50 cc graduation, with tip graduated to %o ce, for cement testing and for 



use where the proportion of sediment is extremely small 1.50 



METAL SHIELD, for carrying No. 2553 Cement Tube 1.10 



TUBE FOR MILK ANALYSIS, graduated for obtaining a reliable test of either breast or cow's 



milk. It will give results accurate to within i of 1 per cent, of fat 65 



CONICAL TUBE, graduated to 50 cc, for use in testing kerosene and other liquids where larger 



quantities are to be tested than can be carried in a 15 ee tube 1.00 



CONICAL TUBE, plain, same as No. 2556 without graduations 50 



ALUMINUM SHIELD for carrying Nos. 2556 and 2557 85 



SPEED INDICATOR 3.00 



CENTRIFUGES for Oil, see Oil Testing Apparatus. 



CENTRIFUGES, ELECTRIC 

 CENTRIFUGES, VICTOR 



After a careful investigation we have selected the Victor line of electric centrifuges because of their 

 superiority in the following important respects: 



1. The electric motor, which is the heart of any centrifuge, is carefully made, obviating any elec- 

 trical troubles, such as burn-outs, overheating, loose contacts, etc. 



2. The shaft is accurately centered, preventing vibration. 



3. The motor is so wound that by shifting a single contact in the base, it can be changed from an 

 A. C. to a D. C. motor. It is not a universal motor. 



4. The centrifuge head is carefully balanced and weighted so as to produce a smooth uniform mo- 

 tion, without any jerk in starting or stopping. 



5. The relation between speed, weight, and centrifugal force has been worked out with mathe- 

 matical exactness so that one can instantly determine what centrifuge to procure in order that a given 

 force may be exerted on the suspended particles. 



6. The construction and finish of these centrifuges are such as to afford the greatest protection 

 from chemical reagents. 



7. A complete line of accessory parts, including glassware, is available. 



2570. CENTRIFUGE, Victor No. 3, with motor entirely enclosed in enameled iron jacket. Can be 

 operated on either 110 volt A. C. or D. C. by shifting a single connection in the base. Complete 

 with two-tube head of heavy construction, with attached trunnion rings, two conical aluminum 

 shields for 15 cc tubes, and attachment cord and plug, without glassware. 

 Specifications : 



Height over all, 12 inches. B. P. M. (A. C.) 1500. 



Width over all, rotating, 15 inches. Relative force (times gravity) 325. 



Weight, 23 pounds. R. P. M. (D. C.) 1800. 



Average spread, 26 cm. Relative force (times gravity) 469. 



Price $32 00 



2572. CENTRIFUGE, Victor No. 3, same as No. 2570, but arranged for 220 volts A. C. and D. C. 35.00 



