DUST SPRAYERS 



59 



little or none. Should one be using Paris green in a liquid from 

 a bucket, this should be borne in mind, and the liquid almost 

 constantly stirred. 



Tanks for Field Use. These can be made of galvanized iron 

 or pine, cypress or cedar. The last is said to be the best of the 

 woods for this purpose where obtainable. When made of wood, 

 the inside should be painted. Tanks vary greatly in size. Two 

 horses cannot comfortably draw more than 250 gallons of liquid 

 over the field. 



FIG. 88. 1. Bordeaux nozzle. 2. Disc type of nozzle; and 3. Double Vermorel. Britton 

 and Clinton. Report of Conn. Station, 1911 



Knapsack Sprayers. These are machines intended to be car- 

 ried around on the person's back, or lifted about by hand when 

 desired. They are excellent for work with shrubbery or in garden 

 where too much ground is not to be covered. The writer speaks 

 from personal experience when he says that after several fillings, 

 the weight tells upon one's back and shoulders (Fig. 73). 



Dust Sprayers. The simplest form of dust sprayer is found, 

 perhaps, in the little bellows sold at drug stores, and used to dis- 



