Bui. 90, Part I, Buieau of Entomology, U. S. Dept. of Agriculture. 



Plate III. 



-j 



Fig. 1.— Method of Attaching Tent to Hoisting Pole by a Half Hitch of the 

 Rope. The Edge of the Tent is Double-lapped. (Original.) Fig. 2.— Top of 

 Derrick, Showing Method of Attaching Pulley and Guy Rope. Fig. 3— Base 

 of Derrick, Showing Method of Constructing Braces. (From Morrill.) 



