270 



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



No. 6416. 



6416. FURNACE, Tube or Bomb, DeKhotlnsky Electrically Heated and Regulated, for use in chemical, 

 physical and mineralogical laboratories where constant temperature is imperative during long 

 periods, and where reaction is desired under pressure in a sealed tube. 



A rectangular copper container 1 mm in thickness with an end plate 1% mm in thickness is 

 fitted with four tubes 35 mm inside diameter and 54.5 cm long, tinned inside. The container is 

 enclosed in a box of asbestos-wood coated with white enamel, thoroughly baked on. The space 

 (25 mm) between box and container is filled with heat insulating material (85 per cent, mag- 

 nesia and 15 per cent, asbestos). The furnace rests on a nickel-plated stand with the usual 

 incline of 50 mm per meter. Both ends of the furnace are provided with four electric heating 

 units of 115 watts each, three of which may be conveniently added one by one, by means of the 

 switch, which constitutes a part of the furnace. The fourth unit is electrically connected to 

 our standard sensitive relay, which is automatically operated by a DeKhotinsky mercury 

 thermo-regulator. Nickel-plated hoods, hinged at the top, are provided at the ends to prevent 

 injury from flying glass in case of explosions. 



By means of the thermo-regulator the temperature of the furnace can be maintained with a pre- 

 cision of i^o degree C. within a temperature range from that of the surrounding atmosphere to 

 100 degrees C., if the container is filled with water; or up to 160 degrees C. if it is filled with 

 Criseo or oil. Outside dimensions, 55 cm long by 24 cm wide by 25 cm high. Complete with 

 water gage, constant water level, 6 feet of connecting cord and separable plug for attachment 

 to any lamp socket. 



No. . A B C D 



A. C. D. C. 



For volts 110 220 110 220 



Each $112.50 115.00 110.00 112.50 



Note: In ordering A. C. Furnaces, kindly state number of cycles. 



6420. FURNACE, Tube or Bomb, Carius, of iron, with openings for five tubes 20 inches long up to 1 '4 

 inch in diameter 15.00 



