P is a tube running from the egg chamber H 

 through the heater S, and through which the rod 

 L passes. A constant discharge of air flows 

 through this tube, from the egg chamber. It is 

 never closed. 



X is one of the lamps, two being used at diag- 

 onally opposite corners of the incubator. 



YYY is a five-inch space between the inner and 

 outer wall of the improved incubator and is 

 packed with mineral wool and granulated cork. 

 All of the hot-air pipes are incased in asbestos or 

 mineral wool. 



DIRECTIONS FOR OPERATING 



THE VON CULIN IMPROVED SIMPLICITY HATCHER. 



HHBO 



THERMOSTAT 



Light the lamp or lamps, turn the flame to ordin- 

 ary height, with regulator as shown above, except 

 that the perpendicular rod which connects the lever 

 with the thermostat in the egg chamber by means 

 89 



