GIPSY MOTH TREE-BANDING MATERIAL. 5 
consequently a small amount of heat is necessary to insure the proper 
mixture. Also, when the viscosity of the rosin oil is high, it is 
necessary to apply heat to the mixture in order to thin the rosin oil 
i 
DRIVE GEAR 
> 
Fig. 1. — Sectional view of kettle or mixer of 25 gallons capacity showing detailed ar- 
rangement of transmission and paddles for use in preparing gipsy moth tree-banding 
material. 
so that it will combine properly with the other ingredients. During 
hot weather it will usually mix well without the addition of heat. 
In most cases the materials, when being mixed, should be kept at tem- 
peratures ranging from 60° to 75° F. 
