342 



A. DAIGGER & COMPANY, CHICAGO, U. S. A. 



6142 



6142 THELCO LOW TEMPERATURE INCUBATOR. Constant temperature in the 

 Thelco Incubator is maintained by circulation of cool air around the nar- 

 row water jacket of the incubator chamber. The cool air is admitted from 

 the ice chamber through a shutter operated by a milled head screw on the 

 outside. This shutter is adjusted to maintain a cool air temperature slightly 

 below that required and the electric heating plate under the water jacket 

 brings the chamber to the right temperature. A Thelco spiral bimetallic 

 regulator controls the heating plate. This method maintains a uniform 

 temperature throughout the chamber and is very economical of ice. In 

 ordinary weather a single supply of ice will last several days. Although 

 designed primarily for gelatine culture cultivatipns at 20 C, the incubator 

 can be used just as satisfactorily at any predetermined temperature from, 

 about 10 C. to 40" C, or at temperatures below 10 C. by using a suitable 

 cooling mixture. 



The heating plate is a wire-wound resistance, readily removable and 

 controlled by the strong but sensitive Thelco regulator, which maintains 

 the temperature constant to 1 C. A switch for turning on and off the 

 current and a pilot lamp are mounted on top of the apparatus. 



The incubator chamber is double-walled, of heavy copper and pro- 

 vided with three perforated shelves, which may be placed at any desired 

 height. It has a felt-cushioned, glass door, which is air-tight. The cabinet 

 is of wood, insulated with felt and dead air-spaces, making in all 10 walls. 

 It is entirely sheathed in steel plate, handsomely finished in white 

 porcelain, with polished aluminum trimmings. The incubator is mounted 

 on a heavy iron base. Size, 46 inches high, 38 inches wide, 31 inches 

 deep $325.00 



(Please state voltage and current when ordering.) 



