De Khotinsky 



ELECTRICALLY HEATED AND REGULATED 

 INCUBATOR AND DRYING OVEN 



Patent Pending 



No. 4867E. 



4867E. Drying Oven and Incubator. 



The Cabinet has double walls of asbestos board, which is fireproof and a poor conductor 

 of heat. The space between the walls is filled with magnesia-asbestos (magnesia 85 per cent, 

 asbestos 15 per cent). The door is constructed on the same principle as the walls. To pre- 

 vent loss of heat by conduction from the inner to the outer walls, no metal framing is used in 

 the construction of these cabinets. The perforated shelves are of the same material as the 

 walls, since this material resists the corrosive eflfects of laboratory fumes and chemicals. 

 The outer casing is finished with white enamel, which is baked and polished. All cabinets 

 are mounted on nickel-plated steel bases. 



Heating of the cabinet is effected by means of the De Khotinsky standard heating units, 

 any one of which can instantly be replaced in case of an accidental breakage, without stop- 

 ping the service, or opening the door of the cabinet. This is possible because the units are 

 inserted from the outside of the cabinet. The four heating units are located between the 

 two bottoms of the cabinet, and the inner bottom has an opening over the heating units 

 which is covered with a deflecting plate. Only one unit is directly connected with the relay, 

 and this unit is used as a heat regulating unit. The remaining units are controlled by the 

 switch and are placed in service one by one to attain the desired temperature. The regulating 

 unit will generally maintain the temperature from 5 deg. to 70 deg. C. above the surrounding 

 temperature, and the temperature of the cabinet depends only on the setting of the thermo- 

 regulator. For a temperature from 70 deg. to 120 deg. C. a second unit should be introduced 

 by means of the switch. Regulator precision, j\° C. 



Si7,e, 7 in. wide bv 6k in. deep by 10 in. high. Complete with four 50-watt heating units Net $45.00 



4867F. Drying Oven and Incubator. ?ameas No. 4867E, but 12 in. wide by 11 in. deep by 14 in. high. Complete 



with four 115-watt heating units Net 85.00 



4867G. Drying Oven and Incubator. Same as No. 4867E, but 16 in. wide by 14 in. deep by 19 in. high. Com- 

 plete with four 140-watt heating units Net 135.00 



Note: Add to above prices for 1/50 defe. C. precision, $5.00; for 1/100 deg. C, $10.00; for 1/200 deg. C, $20.00, 



and for 1/1000 deg. C, $25.00. 



Send for Pamphlet 61 describing the De Khotinsky Electrically Heated and Regulated 

 Constant Temperature Devices. 



CENTRAL SCIENTIFIC COMPANY 



460 East Ohio Street 

 (Lake Shore Drive, Ohio and Ontario Streets) 



CHICAGO 



U. S. A. 



