302 THE HOUSE FLY DISEASE CARRIER 



joist. Stops may be placed inside the door. These 

 should be i inch thick, 3 inches wide, and 6 feet 6 

 inches long, and should be jogged (that is to say, cut 

 out) to fit the cross-cleats (/>) on the door. Close over 

 the top of the door place a strip i inch thick, 2 inches 

 wide, 30 inches long, nailed to I. (Fig. 37). A corre- 

 sponding piece is placed higher up directly under the 

 roof, nailed to G. A strap or door-pull is fastened 

 to the outside of the door. 



Ventilators. There should be five ventilators (w). 

 One is placed at each side of the box directly under the 

 seat; it measures 6 to 8 inches square. Another (12 

 inches square) is placed near the top on each side of 

 the privy. A fifth (30 inches long S l /2 inches wide) is 

 placed over the door, between G and I (Figs. 37, 38). 

 The ventilators are made of 15-mesh copper wire, 

 which is first tacked in place and then protected at the 

 edge with the same kind of lath that is used on the 

 cracks and joints. 



Lath. Outside cracks (joints) are covered with 

 lath one-half inch thick by 3 inches wide. 



Receptacle. For a receptacle, saw a water-tight bar- 

 rel to fit snugly under the seat; or purchase a can or 

 tub, as deep (17 inches) as the distance from the un- 

 der surface of the seat to the floor. If it is not pos- 

 sible to obtain a tub, barrel, or can of the desired size, 

 the receptacle used should be elevated from the floor 

 by blocks or boards so that it fits snugly under the seat. 

 A galvanized can measuring 16 inches deep and 16 

 inches in diameter can be purchased for about $i, or 



