312 BUILDINGS, SANITATION, AND DISEASES 



The ventilator is made by cutting tlie upper ends from two 

 roof boards, opposite one another. Then 2" by 2" pieces are 

 nailed on top of the battens on each side of the opening, meeting 

 at the top, and boards are nailed on top of these strips on each 

 side of the roof. The upper ends of these boards meet at the 

 top, and the lower ends come an inch or two past the lower sides 

 of the opening. 



It is recommended to have a door at the back of the build- 

 ing, similar to the one in front, for purposes of ventilation in 

 hot weather; also a Small opening near the peak at the rear 

 of the building, which could be covered with a slide,- and used 

 to assist ventilation under some circumstances. 



Owing to the fact that the runners are likely to decay, 

 some prefer to have them not fastened to the building, so that 

 they can be renewed conveniently. In the plan 'shown, the 

 runners are fastened to the structure, but they could be attached 

 by means of bolts, so that it would not be difficult to renew 

 them. An application of tar would save them many years. 



The Shed Roof Pen.— (Wisconsin Bulletin 153.) The pen 

 shown in the ilkistration is six feet four inches wide and eight 

 feet long. In the rear, it is provided with a door, the same size 

 as the lower front door, which is placed diagonally opposite, so 

 that by opening all the doors, it makes a cool house in summer. 

 By closing both lower doors and opening the upper front door 

 for ventilation, it makes a warm house for cool weather. The 

 upper front door can be fitted with a wooden ratchet, by means 

 of which it can be held in any position desired. 



To build the pen, construct the frame 8' 0" long, by 6' 4" 

 wide, on seven 2" by 4" joists six feet long. Nail two pieces of 

 2" by 4" scantling across the ends of the joists, which will make 

 the foundation for the floor 8' 0" by 6' 4". Beneath the 

 frame are nailed three 2" by 4" pieces which serve as runners 

 for moving the building. The pen illustrated here is six feet 



