INCUBATION 



419 



this chamber and, as the chicks are attracted by hght, they 

 come to the edge and fall into the nursery tray. This arrange- 

 ment is to relieve the congestion of the egg-tray during 

 hatching. 



Fig. 155. — Showing method of handling lamp ^Essex). 



The regulating device is so constructed that a fairly even 

 temperature is maintained in the egg chamber (Figs. 153-156). 



The incubator has a ventilator at the bottom to allow the 

 escape of the carbon dioxid laden air, this should be kept open 

 at all times. 



The thermoregulator (Fig. 157) consists of a thermostat 



