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



319 



7898. INCUBATORS, Single Wall, DeKhotinsky Electrically Heated and Regulated (Patented), with 



new bimetallic thermo-regulator. 



Construction: The incubator is built of *4-inch asbestos board on a steel frame with a founda- 

 tion of %-ineh asbestos board. To effect the greatest uniformity of temperature possible in 

 an incubator of the single wall 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 incubator, and after circulating through the chamber 

 returns to the inter-bottom space by way of an opening in the front part of the false bottom. 

 Two shelves of the grid type are provided which, by means of racks, may be set at any 

 desired height. An inner glass door permits inspection of the interior without cooling the 

 contents. The incubator is mounted on a japanned steel base. 



Heating of the incubator is effected by means of four of our standard heating units of 115 

 watts each, three of which are permanently connected to the switch contact springs, and the 

 remaining one the heat regulating unit is in circuit with our bimetallic thermo-regulator 

 for automatic control of the desired temperature. The system is fused for protection. 

 Temperature control is effected by means of our new bimetallic thermo-regulator, which is 

 made from invar-brass ribbon, and can be set at any desired temperature from that of the 

 surrounding atmosphere to the maximum heat capacity of the incubator, about 95C. This 

 range of temperature permits the use of these instruments as incubators, paraffine baths, or 

 inactivation chambers. The precision of action of this thenno-regulator is ^4C. The make- 

 and-break contact of the thermo-regulator is located outside the incubator, to prevent the 

 possibility of ignition of inflammable gases developed in the inner chamber when used as a 

 paraffine'oven, which often occurs when the contact is made and broken inside. A pilot lamp 

 on top of the incubator is connected in series with the thermo-regulator, enabling the operator 

 to determine at a glance whether the incubator is regulating. These incubators can be oper- 

 ated on either A.C. or D.C. circuits. Complete with two extra cartridge fuses, Hubbell recep- 

 tacle, and 5 feet of flexible asbestos covered cord with separable Hubbell attachment plug. 



Xo A B 



Height inside, inches 12 12 



Width inside, inches 11 11 



Depth inside, inches 9 9 



Shelf space, square inches 220 220 



For volts 110 220 



Each $50.00 52.50 



7900. INCUBATORS, Single Wall, DeKhotinsky Electrically Heated and Regulated, of same con- 

 struction as Xo. 7898. but larger, with two doors and with eight 115-watt heating units. With 

 same equipment as No. 7898. 



No A B 



Height inside, inches 14 14 



Width inside, inches 18 18 



Depth inside, inches 12 12 



Shelf space, square inches 430 430 



For volts 110 220 



Each 70.00 72.50 



For EXTRA HEATING UNITS for Nos. 7898-7900, see Nos. 7526-7. 

 For EXTRA FUSES for Nos. 7898-7900, see No. 9850. 



