104 ACCESSORIES 



readily, are satisfactory. Iron tanks are somewhat objectionable 

 because if copper compounds, such as Bordeaux mixture or copper 

 sulphate solution, are used in such tanks, the chemicals will tend to 

 break down. Other chemicals have a corroding action on the iron. 



Mixing Tanks 



Where extensive spraying is carried on it is convenient and desirable 

 to provide suitable mixing tanks elevated on a stout platform. By 

 this means much valuable time will be saved in the preparation of 

 materials. In addition, the work of spraying can be completed more 

 promptly, the materials applied when they will do the most good, and 

 advantage taken of favorable weather conditions. 



The design of a mixing plant will depend on the nature of the work to 

 be done, the amount of work, the topography of the location, the source 

 of water supply, and like matters. The general principles governing 

 its design are the provision of an adequate supply of stock solution, 

 convenience in mixing, and the utilization of gravity in transferring 

 liquids from stock tanks to mixing tanks, and from the latter to the 

 spray tank. Expensive and troublesome outlet valves may be avoided 

 by using a section of large diameter hose, the free end of which may be 

 fastened up above the level of the hquid in the tank. 



