14 POULTRY HOUSES 



A sash hinged at the top and opening outwards, as 

 shown in Fig. 1 (c), is a modern construction for venti- 

 lation. When opened slightly, a window of this kind 

 will give ventilation and yet turn rain or snow away 

 from the opening. This kind of window serves best 

 when used for the outer covering. Inner protection can 

 be had by fastening a window frame to the inside of 

 the window, this frame to be covered with heavy gal- 

 vanized wire cloth with a mesh no larger than \ in. 



One of the very best types of glass window for pro- 

 tection and ventilation is represented in Fig. 1 (a). The 

 sash in this window is hung on pivots or sash centers. 

 A glass window of this kind provides almost ideal venti- 

 lation; it can be opened any distance from an inch to 

 a foot. The air coming in is driven to the roof and is 

 spread out there and distributed throughout the entire 

 house. Proper ventilation and a dry interior result 

 through the use of these windows without the use of 

 open fronts or muslin windows. 



Where the open fronts, the muslin windows, and this 

 type of glass window are used, the process of ventilation 

 is simple. When the sashes are closed and the front 

 open the sun shines bright and warm through the win- 

 dows into the most remote part of the building. The 

 admission of fresh air and sunshine through the open 

 front dries and tempers the atmosphere. When the 

 weather is cold or stormy or when the wind is blowing 

 fast or cold, or snow is coming into the house, ventila- 

 tion may be had by entirely closing the open front with 

 muslin -covered frames, as shown in Fig. 1 (cO, and open- 

 ing the glass window a few inches as may be needed. 



A wooden shutter or ventilator as a substitute for open 

 windows has been used at the Missouri State Poultry 

 Experiment Station. This ventilator is shown in Fig. 1 

 (e). It should contain 1 sq. ft. of surface for each 10 sq. 

 ft. of floor space. The strips used in the construction 

 should be 4 in. wide and set at an angle of about 

 45 degrees, leaving a space of 1| in. between the strips. 

 Where the weather is extremely cold, thin muslin can 



