192 



POULTRY PRODUCTION 



is usually poured into the heating chamber, from which it is 

 introduced into the egg chamber by diffusing through a 

 thickness of cloth referred to as the diaphragm or membrane. 



Fig. 93 



Hot-air incubator. Using both radiation and diffusion. (Courtesy of Sears, 

 i Roebuck & Company.) 



Fig. 94 



Hot-water incubator heated by drum. (Courtesy of Seeirs, Roebuck & 



Company.) 



