ground rail 



28-inch stake 

 with haljf hook 



Figure 5. — Diagram of framework, guy wires, and anchor stakes with fitting 

 numbers indicated.-. 



The initial cage covering was fabricated with Government surplus 20-niesh Saran 

 screen sewn into large panels, which were attached with zippers 82^ inches long — 

 nine zippers on the sides and three on the ends. All zippers were the same length and 

 oriented so that the panels were interchangeable. The number and length of the zippers 

 were determined on the basis of economical cutting of uniform pieces from standard 

 21-foot pipe lengths. 



Medium-duty zippers on high-quality, mildew- resistant webbing were recom- 

 mended by several manufacturers. Heavy-duty 101-inch zippers have since been 

 obtained from Government surplus, and these would be our choice provided the webbing 

 lasts as long as the heavier zippers. It is essential that all zippers be of equal length. 

 Factory- run zippers of 6- to 9-foot lengths vary in length as much as 4 inches. The 

 zippers used were obtained in uniform length at an additional cost of 20 percent. It is 

 not difficult to adjust them to standard length (minimum of factory run) by changing the 

 stopping link or pin, depending on the type, but such changes add to the cost either in 

 fabrication or installation. 



