408 IRRIGATION FARMING. 



?t^nchi^3"S or stay -braces connedled with the beam, as 

 shovvu 111 Fig. 98. A flap is attached to the apron 

 under openings made just under the pole on the up- 

 stream side in such a way that the weight of the water 

 will hold it in position and allow the desired amount of 

 water to pass through. 



The Van Horn Tap Gate. — This is the inven- 

 tion of J. A. Van Horn, of Caiion City, Colorado, and 

 is not patented. It may, therefore, be used by any 

 one who irrigates land through laterals. The various 



FIG. 98 — THE VVITCHER CANVAS DAM. 



forms of its construction are shown in Fig. 99. The 

 design. A, shows a plain box made by nailing four 

 boards opposite each other, perfedlly square on the 

 front end. B represents A with four boards on the 

 outside, breaking joints, three of the outside boards 

 extending forward of the inside box, which makes a 

 box, or pipe, stronger than if made of two-inch lumber, 

 having free passage for water. For tapping reservoirs 

 and main ditches under high pressure put a gasket on 

 the end "of the inside box, thus making it absolutely 

 water-tight. C needs no explanation other than that 



