374 



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



9624. 



9626. 



9627. 

 9628. 

 9629. 



9630. 

 2556. 



9631. 



9632. 

 2558. 



9640. 



Nos. 9624-6. 



No. 2556. No. 9631. 



No. 9640. 



CENTRIFUGE, Electric, for 110 volts, mounted on heavy enameled cast iron base, enclosing 

 the motor. The shaft is accurately centered, preventing vibration. The motor is carefully 

 constructed for centrifuge work and is so wound that by shifting a single contact in the base, 

 it can be changed from A.C. to D.C. or vice versa. It is not a universal motor. A rheostat 

 in the base provides for three different speeds. Complete with two-tube B. S. arm with con- 

 ical shields, two Graduated Glass Tubes No. 9631 reading directly in percentage of B. S., 

 attachment cord and plug $59.75 



CENTRIFUGE, Electric, same as No. 9624, but wound for 220 volts A.C. or D.C. The change 

 from A.C. to D.C. or vice versa is made as in No. 9624, by shifting a single contact in the 

 base 62.75 



Parts and Accessories for Centrifuges. 



ARM, Revolving, B. S., for Centrifuges Nos. 9620 and 9622, with trunnion rings and with two 

 conical metal shields for use with 100 cc Glass Tubes No. 9031 17.30 



ARM, Revolving, B. S., same as No. 9627, but made only for Centrifuges Nos. 9624 and 

 9626 18.75 



ARM, Revolving, for Nos. 9620-9622, with two trunnion rings and metal tube shields for use 

 with 50 cc glass tubes No. 2556, for the examination of kerosene 17.30 



ARM, Revolving, same as No. 9629, but made only for Centrifuges Nos. 9624 and 9626. . 18.75 



GLASS TUBES, Graduated, for use with Nos. 9629-30, for the examination of kerosene. Capac- 

 ity, 50 cc, graduated to read to % cc in the tip each 1.00 



GLASS TUBES, Graduated, for use with Nos. 9627-8, for the determination of B. S. in oils. 

 Capacity, 100 cc, graduated in 200 parts. As equal parts of oil and gasoline are mixed in mak- 

 ing this test, this graduation enables the B. S. to be directly in percentage. By means of 

 the narrow tip, amounts as small as i{ of 1 per cent, can be measured each 1.50 



METAL SHIELDS, for use with Arms Nos. 9627 and 9628, for holding B. S. Tubes No. 

 9631 each 1.50 



METAL SHIELDS, for use with Arms Nos. 9629 and 9630, for holding Kerosene Tubes No. 



2556 i each .85 



For other CENTRIFUGES, see general heading Centrifuges. 



DISTILLATION APPARATUS, for determining boiling and end points of gasoline, petroleum 

 oils and paint thinners, according to the design of Sub-Committee XI of Committee D-l of 

 the American Society for Testing Materials. This apparatus is recommended as standard 

 for the testing of motor gasoline by the United States Bureau of Mines. The apparatus 

 consists of a copper condenser trough with brass condenser tube and support; a burner guard 

 of galvanized iron lined with asbestos, with door and hand opening; a Bunsen burner adjust- 

 able for air and gas; 3 feet of rubber tubing to connect burner with gas supply; a support 

 stand with 4-inch ring; asbestos mat 5x5 inches with l a /4-inch circular opening; two clamps 

 for supporting flask and burner; Engler flask, 100 cc; two corks for same, with hole for 

 thermometer; thermometer graduated to 270C., according to specifications of the Bureau of 

 Mines; cork to connect Engler flask with condenser tube; graduated cylinder, 100 cc capac- 

 ity; and piece of fiber board to fit over end of condenser tube and cover cylinder. Complete 

 as illustrated, with directions for use. (See Standards of the American Society for Testing 

 Materials adopted in 1917, page 8; Technical Paper 166 of the United States Bureau of 

 Mines) 25.00 



