132 SPRAY MACHINERY AND SPRAY MATERIALS 



The barrel sprayer usually holds about fifty gallons. It 

 requires two men to operate it. The barrel is either mounted 

 on a sled or on wheels. 



Twin-cylinder Hand Sprayer. — The twin-cylinder hand 

 sprayer is decidedly the most satisfactory hand pump. By 

 the use of the two cylinders, a balance of power is obtained, 

 which ensures an even flow to the air chamber, which is not 

 obtainable with a single-cylinder pump. 



Fig. 60. — Two-cylinder hand sprayer, mounted on a sled. This is an excel- 

 lent type for a small sprayer. (The Goulds Manufacturing Company.) 



The working parts of this pump are usually made of brass. 

 The construction is strong, compact and convenient. 



The pump is operated by a handle which is removable, and 

 can be used in either a vertical or a horizontal position. 



The double-cylinder pump is a very efficient sprayer. It is 

 used for orchards of considerable size, and a much greater 

 pressure can usually be maintained with this sprayer than 

 with any other hand pump. It is remarkably easy to operate. 

 This pump is usually mounted on a wagon or a sled. The 

 vessel holding the spray material may be either a tank, or 

 a barrel, depending upon the size of the orchard and the 

 inclination of the owner. 



