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



271 



No. 6424. (Shown In use.) 



No. 6436. 



No. 6424. (Shown in section.) 



6424. FURNACES, High-Temp Electric, for temperatures from 500 to 1800C. This is a low amperage 



furnace operating on either A. C. or D. C. tip to 125 volts, a feature which should commend it 

 to users who are not equipped with transformers or generators for producing low voltage and 

 high amperage currents. The heating element is of the granular resistance type entirely sur- 

 rounding the cylindrical heating chamber. Outside of the heating element is a concentric 

 cylinder of refractory material surrounded by packing of heat insulating material, making a 

 compact furnace of a high degree of efficiency. All parts are easily replaceable at little ex- 

 pense. With a maximum load of 40 amperes and a maximum power consumption of 2.75 kilo- 

 watts, the furnace can be brought to a temperature of 1600 C. in an hour. A switch board is 

 furnished with voltmeter, ammeter, circuit breaker, line switch, and rheostat for controlling 

 the temperature. Diameter of heated chamber, 2^4 inches; depth, 3% inches; outside diam- 

 eter of furnace, 14% inches; height over all, 19 inches. Dimensions of switch-board panel: 

 17 inches wide, 26 inches high, and 1 inch thick, requiring 9 inches of space for mounting. Com- 

 plete with furnace, switchboard, 7 feet of asbestos covered flexible leads, 5 pounds of granular 

 resistor material, and instructions for use, but without crucible. 



No A B 



For volts 110 A. C. 110 D. C. 



Each $205.00 195.00 



6425. GRANULAR RESISTOR MATERIAL for Xo. 6424 per 5 pounds 1.50 



6426. SPECIAL CRUCIBLES for No. 6424, capacity 60 cc each 1.25 



Note: Price of parts of No. 6424 for replacement furnished on request. 



6436. FUSEL OIL APPARATUS, Bromwell, with stop-cock and glass stopper ground in, as used by 

 the Association of Official Agricultural Chemists. Capacity of lower bulb, 20 cc, stem gradu- 

 ated from 20 to 22 cc in %pth cc divisions. (See Bulletin 107, Bureau of Chemistry, United 

 States Department of Agriculture) 5.00 



