AN IMPROVED SYSTEM. 



59 



and to some extent a disadvantage in practical work. The marking 

 on these hnes gives us an easy means of determining the distance 

 over the top of the tree. Our experience has shown that the distance 

 around the tented tree can be measuKed very accurately by pacing. 

 The one whose work, in a regular outfit, is to obtain the dimensions 

 of the trees, should make several practice trials in advance of fumiga- 

 tion, so as to determine the exact length of his pace, and to regulate 

 it, if necessary. 

 In pacing the dis- 

 tance around a 

 tree it is well to 

 keep far enough 

 from the edge of 

 the tent — say 

 from 6 inches to 1 

 foot distant — to 

 prevent the body 

 from coming into 

 contact with it. 

 The length of the 

 pace should be 

 regulated to 2 A or 

 3 feet when ap- 

 proximating the 

 actual distance 

 around the tented 

 tree, preferably 3 

 feet, if the pacer 

 can step that dis- 

 tance without 

 much exertion. 

 In reality the dis- 

 tance paced will 

 be slightly greater than the actual circumference of the tent. From 

 these two measurements (the distance around and the distance over), 

 it is possible to approximate the cubic contents of the tree. 



Fig. 22.— Difference in th^ 



generator and from one covered with ttie corrugatt. 



i))ing Iniiii an open , 

 1 lid. (,<.)nginal.) 



SUPPLY CART. 



With this system some change is necessary in the character of the 

 vehicle for carrying materials, inasmuch as the measuring of chem- 

 icals is conducted at the tree. A two-wheeled handcart of the same 

 general description as that in use by the San Bernardino County 

 outfits has been adopted. The handle of the cart and the arrange- 

 ment of the lights have been improved upon; while the use of faucets 

 in drawing off the acid and water is also an improvement. One of 



