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



373 



2361. 

 2362. 

 9580. 



9600. 

 0601, 



9608. 

 9609. 

 9612. 



'i . 



9622. 



No. 9612. 



No. 9609. 



No. 9622. 



No. 9620. 



MOTORS, Variable Speed, for use with Nos. 9560 and 9566. 



For 110 volts $23.00 



For 220 volts 23.00 



NOMON, a Calculating Chart, Chemists' Edition, designed by Horace G. Doming of the Uni- 

 versity of Illinois. This device consists of a set of 18 sections bound together in book form, 

 each section containing 13 engine divided scales, with about 40,000 separate points or sub- 

 divisions. By means of the Nomon, the mathematical operations of multiplication, division, 

 raising to powers, extracting roots and determination of reciprocals can be performed rapidly 

 and with an accuracy five times as great as with an ordinary slide rule. In addition practi- 

 cally all the special mathematical operations peculiar to chemistry and chemical engineering 

 can be performed easily and accurately. Complete with book of scales, two sheets of recip- 

 rocal cross section paper, five place table of logarithms, and a manual of instructions con- 

 taining tables of chemical data and factors conveniently arranged for use 1.00 



OIL CAN, zinc, diameter 2 inches, 22 cc capacity 10 



OIL CAN, same as Xo. 9600, filled with fine sperm oil .25 



OIL SAMPLE BOTTLES, see general heading Bottles. 



OIL STONE, Washita, genuine, 5-inch, unmounted 60 



OIL STONE, Washita, Mounted, same as No. 9608, mounted in case 70 



OIL STONE, Washita Slip, beveled with rounding edge, for gouges and fine tools. Length, 4 

 inches .30 



OIL TESTING APPARATUS 



CALORIMETERS, see general heading Calorimeters. 



CENTRIFUGE, Hand Driven, high speed, giving 1000 to 3000 revolutions per minute. The case 

 is of iron well finished, the bearings of phosphor bronze accurately machined, the gear 

 wheels of hard bronze cut by special machinery and the pitch so calculated as to render 

 the machine almost noiseless in operation. Complete with disengaging handle, two-tube arm 

 with conical shields, and with two Graduated Glass Tubes, No. 9631, reading directly in per- 

 centage of B. S " . 30.00 



CENTRIFUGE, Water Motor, similar in construction to No. 9620, but operated by a ball-bear- 

 ing water motor. The shaft is suspended on hardened steel ball-bearings in such a way that 

 the water cannot come in contact with the bearing surfaces. In this way all danger of rust 

 or clogging is avoided. Complete with 3 feet of pressure tubing, hose connection for ordi- 

 nary smooth faucet, two-tube B. S. arm, and two Graduated Glass Tubes No. S631, reading 

 directly in percentage of B. S 24.00 





