308 COMMERCIAL POULTRY RAISING 



least three sides, and so arranged as to flood the interior with sun- 

 light. Except in very warm weather, these windows should not 

 be relied upon for ventilation, for it is almost impossible to venti- 

 late in this manner without creating drafts. It is the draft, not 

 fresh air, that causes trouble. 



Ventilation. — The" following system of ventilation has given 

 excellent results, and it may be installed in any house at a moder- 



{Courlesy Prairie Stale Incubator Co.) 



Fig. 202. — Filling the coal hopper of a brooder stove. 



ate cost: In the four corners of the brooder house, and about 

 one foot above the floor line, cut circular openings in the walls 

 about six inches in diameter, and with ordinary stove-pipe and 

 elbows construct an S-shape ventilator, pointing downward on 

 the outside and upward on the inside. Over the inside opening 

 place a screen to prevent chicks from flying into it, also a damper 

 to control the intake of air. In the center of the roof install an 

 exhaust vent or cupola having an area twice as great as the com- 



