18 



FUMIGATION FOR THE CITRUS WHITE FLY. 



would therefore measure before shrinkage ^2j feet (49 feet 10 1 inches 

 + 3 feet 4 inches) lengthwise of the strips through the middle section, 

 and 49 feet 10^ inches crosswise of the strips. After shrinking, the 

 dimensions would be approximately 49 feet 4^ inches in each direc- 

 tion. The two sides of the octagon which are formed by the ends of 

 the full-length strips are known as the "ends" of the tent and the 

 sides of the octagon which are parallel with these strips as the "sides" 

 of the tent. 



By gathering the cloth around a tightly-rolled wad of burlap and 

 tying on an iron ring, a convenient arrangement is made for attach- 

 ing the hooks or poles when covering trees. 

 (See fig. 2.) In the case of the smaller sizes 

 of sheet tents, which are to be handled with 

 simple poles, these rings are unnecessary, at- 

 tachments being made in the manner here- 

 after described. For large tents, measuring 

 more than 42 or 45 feet, it is probably best 

 to use the rings in all cases. It is most con- 

 venient to have one of these rings located a 

 few feet in from each of the four corners of 

 the middle section of full-length strips (fig. 1 , 

 B) . In general, the distance in from the mar- 

 gin should be from one-twelfth to one-tenth 

 of the distance betM^een parallel sides of the 

 tent, and the distance between the two rings 

 on each side should be from one-third to two- 

 fifths of the distance between parallel sides. 

 To the ring mentioned a chain link is some- 

 times attached (e), called a " jingler," the ob- 

 ject being to indicate the position of the ring 

 when the operator shakes the tent, enabling him readily to locate 

 it at night. 



In order to provide for the increased stress on the cloth at the points 

 wdiere these rings are to be located, a reenforcement should be stitched 

 on near each of the "ends" of the tent. The main stress in handling 

 a tent is directly behind the catch rings or places of attachment when 

 poles are used without rings. There is also considerable stress across 

 the tent directly between the two rings or places of attachment. 

 Both of these stresses may be provided for by a reenforcement con- 

 sisting of one-half width of the goods used in constructing the tent, 

 sewed entirely across the full-length strips of the middle section and 

 extending 2 or 3 feet onto each of the side sections. These reenforce- 

 ments are located in accordance with the directions given in the 

 preceding paragraph and as shown in figure 1 {R, R). 



Fig. 2.— Method of attaching 

 hooks to tent when covering 

 trees with aid of derricks: a, 

 Tent gathered around ball of 

 burlap or other suitable ob- 

 ject; b, stout cord for attach- 

 ing ring; c, catch-ring; d, hook 

 on pulley block; e, lap link 

 or"jingler." (Original.) 



