CHAPTER XVII 



ARTIFICIAL INCUBATING AND BROODING 



Note to Teacher : The student should study and make drawings of 

 the various parts of an incubator. 



211. Artificial Incubation. By artificial incubation is meant 

 hatching eggs with an incubator. 



212. Artificial Brooding. By artificial brooding is meant rear- 

 ing chicks with a brooder. 



213. Kinds of Incubators. There are small and large incu- 

 bators. The small incubators are of various capacities, some 

 holding sixty eggs, others 120, 144, 150, 200, and 240 eggs. 

 The largest incubators are called mammoth because they hold 

 from 1200 and 1800 to several thousand eggs. 



214. Fuel Used in Incubators. The fuel used in incubators, 

 both small and mammoth, is oil, gas, or coal, or electricity may 

 be employed. 



215. Methods of Heating Incubators. Incubators may be 

 heated by hot water or by hot air through a diffusion diaphragm. 



216. Construction of the Small Incubator. The small incu- 

 bator consists of three essential parts : an insulated and venti- 



*lated box called the body, a heating device, and a heat-regulating 

 device. 



217. The Body of the Incubator. The body of the incubator 

 is supported on legs. The heating device is attached to the side 

 of the body, except in those incubators heated by electricity or 

 by stoves. 



The body is divided into three chambers : an upper, a middle, 

 and a lower. The upper chamber is the heating apartment, and 

 is separated from the egg chamber by a diaphragm in those 

 incubators that are heated by diffusion. In the hot-water system 



