CENTEAL SCIENTIFIC CO., CHICAGO, U. 8. A. 



261 



G226. 

 6227. 

 6228. 

 6229. 

 6230. 

 6232. 



6234. 

 6235. 

 6236. 

 8237. 



6238. 

 6232. 



(1246. 



No. 6246. 



No. 6234. 



FURNACE, Combustion, Multiple Unit Electric, with tube I 1 / 4xl2 inches. The heating element is 

 made up of two units with spiral coils in longitudinal grooves, either of which may be easily re- 

 placed by the user when burned out. Widely used for carbon determinations in iron and steel, 

 heat treatment of small rods or tubes, and for Pyrometer calibration. Can be used inter- 

 changeably on 110 or 220 volts A. C. or D. C., by means of a selective plug supplied with 

 furnace. Maximum power consumption, 560 watts. Complete with six feet of flexible cord 

 and connecting plug. Height over all, 10 inches; shipping weight, 25 pounds. 



Furnace only $25.00 



Furnace with rheostat (voltage must be specified) 33.50 



HEATING UNITS for No. 6226, wound ready for use each 3.75 



REFRACTORY only of No. 6228 per unit 1.75 



COILED WIRE only of No. 6228, for rewinding per unit 2.00 



ALUNDUM TUBE for use with No. 6226 in calibrating Pyrometers, 12x1 inch inside diameter 2.00 

 FURNACE, Combustion, Multiple Unit Electric, Hinged Design, permitting inspection of combus- 

 tion tube at any time without removing the same or disconnecting the train. Operates inter- 

 changeably on 110 or 220 volts A. C. or D. C. Maximum power consumption, 750 watts. Ship- 

 ping weight, 33 pounds. Height of furnace to center, 9* inches; length, 12 inches; inside 

 diameter of tube, I 1 /! inches. 



Furnace only 37.50 



Furnace with rheostat (voltage must be specified) 47.50 



HEATING UNITS for No. 6234, wound ready for use each 5.00 



REFRACTORY only of No. 6236 per unit 2.00 



COILED WIRE only of No. 6236, for rewinding per unit 3.00 



ALUNDUM TUBE for use with No. 6234 in calibrating Pyrometers, 12x1 inch inside diameter 2.00 

 FURNACES, Organic Combustion, Multiple Unit Electric, consisting of three sections, each of 

 which can be moved along the rails for use at different points and is operated independently 

 by means of its switch and rheostat on the base. The upper half of each section can be raised 

 independently for inspection without disconnecting the current. The heating units are in two 

 sections, either of which may be easily and quickly replaced by the operator in case of a burn 

 out. The temperature of 1000C. can be reached in 40 minutes and held constant indefinitely by 

 means of the rheostat. Rapid cooling is obtained by raising the upper section. The life of the 

 heating elements is about 1000 hours at temperatures not exceeding 1100C. The trough for 

 supporting the combustion tube is of pure nickel supported at the ends and is free from eon- 

 tact with the furnace. Lengths of the three sections 4, 8 and 12 inches respectively; inside 

 diameter of tube space, 1% inches; lateral adjustment of each furnace, ll 1 /^ inches; distance 

 from bench to center of furnace, 9 inches; length of combustion tube required, 48 inches; total 

 length of base, 42 inches; width of base, 9% inches; height of furnace over all closed, 12^4 

 inches; height over all open, 17y> inches; shipping weight, 135 pounds. 



No A B 



For volts 110 220 



Each ... 125.00 125.00 



