334 CONTROLLING INSECTS AND DISEASES 



Hand Sprayers, Small hand sprayers of varying types are 

 available for the home garden. Among these, the knapsack 

 sprayer is satisfactory, the operator working the pump and di- 

 recting the spray at the same time. Much labor is involved, 

 however ; the tank when full is heavy, and the pressure secured 

 is not great. 



The barrel-mounted hand pump is a step in advance. It 

 will operate one lead of hose and maintain a pressure of 75 to 

 150 pounds with a discharge of 1 gallon or a little more per 



Fig. 125. A traction sprayer, pressure being generated as the wheels turn. 



minute through a small-aperture disk nozzle. The cylinder 

 should be of brass with a diameter of 2 to 2^4 inches and a 

 stroke of 3 to 4 inches. It should be equipped with an air 

 chamber to aid in maintaining uniform pressure. All parts 

 should be readily accessible. An agitator should be attached 

 to the pump handle. The common mounting for the pump is on 

 the head of the barrel as the barrel stands in a vertical posi- 

 tion. The mounting, however, may be horizontal. 



The barrel sprayer may be hauled on skids or a stone boat, 

 placed on a wagon or mounted on wheels. It will answer for 



