124 



BOARD OF AGRICULTURE. [Pub. Doc. 



the inside edges of the boards first described. These over- 

 hang the inner edges, and serve to prevent the windows from 

 swhiguig too far in. The barrel bolt put into place in the 

 sash, several holes bored for it in the triangular side pieces, 

 the hinges fastened on, the window stops of the original 

 window removed, and the Sheringham valve is complete. 

 If the stops are of the right width and thickness, they may 

 be used on the edges of the triangular-shaped board. Hinges 



Fig. 7, — Cross-eection of monitor-roofed stable, with the Sheringham valve system of inlets 

 and outlets. The arrows indicate the direction of Incoming and outgoing cur- 

 rents of air. 



are not necessary, as a strip of board can be nailed across the 

 inner corners of the i)rotecting boards alwve and below ; 

 these, with the barrel bolt, will hold the window firmly in 

 place (Fig. 6). The advantage of not using butts is that 

 the windows are easily removed for cleaning or other pur- 

 poses. 



The form of stable best adapted to ventilation with Sher- 

 ingham valves is one not more than forty or forty-five feet in 

 width, of any length desired. A monitor roof is desirable, 



