CHAPTER X 



THIRTY USEFUL DEVICES 



A convenient inside arrangement which allows 

 all common work to be done from the passageway is 

 indicated by the plan, Figure 96. Drop doors enable 

 the attendant to fill the dishes and troughs, get the 

 eggs, clear of¥ the droppings board, and even to take 

 fowls from the roosts without going into the pens. 

 The diagram shows also a cloth cover to be drawn in 

 front of the roosts on cold nights. 



A ventilator that can be opened and closed at the 

 will of the attendant will give good results if given 

 proper attention, and without attentioM no ventilator 

 will give the best results. All ventilators that are in 

 continuous operation either give too much ventilation 

 during cold and windy weather or not enough during 

 still, warm days. As a rule, they give too much ven- 

 tilation at night and too little during the warm parts 

 of the day. The one illustrated in Figure 97 can be 

 readily controlled and is used by G. C. Watson of the 

 Pennsylvania experiment station. 



Ventilators are not needed in severe cold weather, 

 but during the first warm days of early spring, and 

 whenever the temperature rises above freezing during 

 the winter months, some ventilation should be pro- 

 vided. Houses with single walls will become quite 

 frosty on the inside during severe weather, which will 

 cause considerable dampness whenever the tempera- 

 ture rises sufficiently to thaw out all the frost of the 

 side walls and roof. At this time a ventilator is most 

 needed. A ventilator in the highest part of the roof 



