HOSE AND EXTENSION RODS 



323 



Elevated Towers. — Frequently trees are so high that the man 

 using the spray rod needs to stand at a high elevation above the 

 tank. Towers are then built on wagons holding the spray outfit. 

 This plan makes it possible to reach the upper parts of the trees 

 which might otherwise be missed. 



Fig. 225. — With a gasoline or oil engine a high pressure may be easily maintained, 

 makes a fine mist. (Michigan Station.) 



This 



Hose and Extension Rods. — The hose used in spraying should be 

 strong and durable. On the other hand it should be easily handled 

 and not too heavy. 



Extension rods should be of lengths to suit the kind of spraying. 

 For large trees, rods eight to twelve feet in length are sometimes 

 used. At the base of the rod is a shut-off cock so that the operator 

 in moving the rod from tree to tree, will not lose much material. 

 The nozzle is attached to the end of the rod. Extension rods are 

 usually made of thin brass surrounded by a bamboo tube. Some- 



