384 



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



9834. 

 9835. 

 9836. 

 9837. 



Nos. 9846-7 (Patented). 



OVENS, Drying, Triple Wall, DeKhotinsky, Electrically Heated and Regulated, same as No. 

 9830, but provided with our standard DeKhotinsky mercury thermo-regulator sensitive to 

 i/iQ C., and our sensitive iron clad relay, for controlling the temperature. We recommend this 

 equipment for research work requiring close temperature regulation where careful attention 

 can be given to the care of the regulator, as its supersensitiveness to temperature changes 

 renders it less suitable for routine work than the bimetallic regulator supplied with Nos. 

 9830-1. 



No A B C 



For 110 volts A.C $67.50 102.50 157.50 



For 220 volts A.C 70.00 105.00 160.00 



For 110 volts D.C 65.00 100.00 155.00 



For 220 volts D.C 67.50 102.50 157.50 



EXTRA HEATING UNITS for Nos. 9830 to 9837. 



No 



For oven No 



Wattage 



7526. For 110 volts 



7527. For 220 volts 



9838. 



B 

 A 



60 

 1.00 

 1.25 



D 

 B 



115 

 1.00 

 1.25 



E 



C 



140 

 1.00 

 1.25 



FUSES for Nos. 9830 to 9837, enclosed cartridge type, 250 volts. 



For size ." A-B C 



Amperes 6 10 



Each 15 .15 



Note: We shall be glad to quote prices on request upon our DeKhotinsky Electrically Heated 

 and Regulated Drying Ovens for temperatures higher than 180C. Kindly specify both 

 maximum and minimum temperatures at which they are to be used. 



OVENS, Drying, Single Wall, DeKhotinsky, Electrically Heated and Regulated (Patented), 

 with new bimetallic regulator and new system of ventilation providing for greatest possible 

 uniformity of temperature throughout the oven chamber obtainable in a single walled drying 

 oven. For work requiring the greatest precision of regulation and uniformity of temperature, 

 we recommend our DeKhotinsky Triple Wall Drying Oven. (See description under No. 9830.) 



Construction: The oven is built of J/i-inch asbestos board on a steel frame with a foundation 

 of %-inch asbestos board. To effect the greatest uniformity of temperature possible in an 

 oven of the single walled type, the heating units are placed between two bottoms, the upper 

 bottom being protected from the direct heat of the units by an iron deflector. Air heated 

 by the units passes back between the bottoms, up through the space between the double back 

 to the upper part of the oven, and after circulating through the oven chamber returns to the 

 inter-bottom space by way of an opening in the front part of the false bottom. This feature 

 (patent pending) is peculiar to the DeKhotinsky Single Wall Drying Oven and insures a uni- 

 formity not possible in other types. Two shelves of the grid type are provided, which, by 

 means of racks, may be set at any desired height. The oven is mounted on a japanned steel 

 base. 



Heating of the oven is effected by means of six of our standard heating units of 115 watts 

 each, two of which are permanently connected to the connecting receptacle of the oven, 

 three to the switch contact springs, and the remaining one the heat-regulating unit is in cir- 

 cuit with our bimetallic thermo-regulator for automatic control of the desired temperature. 

 The system is fused for protection. 



