ARTIFICIAL INCUBATION 201 



in at night. Tliis small movable roof section is a great 

 convenience. At the upper and rear third of the sides 

 of the brooding chamber is a ventilator, r, one on each 

 side, and having a tin, galvanized iron or wood shut- 

 ter, as shown. The ventilating holes are two and one- 

 half inches in diameter. 



The heat conductor is a galvanized iron ring nine 

 inches in diameter, and three and one-half inches high. 

 This is fitted into the hole in the wood floor of brooder, 

 and held in place by three nails driven from inner side 

 of ring. To this ring is attached the heat spreader, an 

 inverted cone of galvanized iron, hung to the ring by 

 three strap hooks of galvanized iron. This heat 

 spreader, k, is kept filled with chicken grit or gravel, 

 which serves to hold the heat, and keep the tempera- 

 ture more uniform. The spreader serves to diffuse the 

 warm air equally on all sides under the hover. The 

 ring is wound with a triple thickness of felt, which 

 entirely covers in the metal parts, and does not con- 

 ducf a sufficient amount of heat to make the chicks 

 crowd around the heat flue. It is important that the 

 iron ring be wound with felt or some insulating mate- 

 rial. 



The hover is circular and is twenty-eight inches 

 in diameter. It is made of matched stuff, and has no 

 ventilating hole, as none is needed. A hole is made for 

 the thermometer, and three holes for the hover legs; 

 p is the thermometer, and o the legs. The legs (three 

 in number) are ordinary broom handle, and are drilled 

 so as to be adjustable from four and one-half to six 

 and one-half inches in length, the hover being held in 

 place by nails passed through the drill holes. A double 

 thickness of slashed felt is used for hover curtains 

 (any kind of cloth that does not fray easily will 

 answer). These flaps come down to within half an inch 



