TEST THE BROODING SYSTEM 



309 



bined areas of the fresh air intakes. Cold air expands when 

 heated, hence the necessity for doubhng the size of the exhaust 

 ventilator. 



Ventilating cupolas of galvanized iron may be purchased in 

 varying sizes from sheet-iron workers, or a similar device may be 

 made of wood which will answer the purpose nicely. If one does 

 not wish to cut an opening in the roof, the. highest point in the 



(Courtesy Prairie State Incubator Co.) 



Fig. 203. — Sectional view of coal-burning brooder stove. A, Base; B, ash- 

 pit; C, grate; D, fire draft; E, thermostat wafer; F, counterpoise weight; 

 G, regulator arm; H, escape vent; I, metal hover; J, curtain. 



front wall of the building may be converted into a ventilator, 

 and fitted with a shield or baffling plate to prevent back currents 

 of air or ddving rains from entering the house. 



Test the System. — When the brooder stove and ventilation 

 system are installed, it is advisable to try out the scheme for a 

 few days before the chicks are brought out, in order that the 

 operator may familiarize himself with every phase of the work. 

 Ascertain the exact heating capacity of the stove under severe 



