Minnesota Plant Diseases. 



231 



(3) The working parts should all be of brass and be so ar- 

 ranged that they can be examined without undue difficulty. 



(4) The pump when mounted should not extend above the 

 barrel more than is necessary. 



(5) It is desirable to have the device for attaching to the 

 barrel so arranged that the pump can readily be mounted or re- 

 moved from the barrel. 



(6) The different portions of the pump should be so con- 

 structed that they can be 



readily taken apart, espe- 

 cially those portions which 

 enclose the valves. 



(7) All points for attach- 

 ment of the hose should be 



FIG. 114. An effective nozzle for mist-like 

 CUt with threads Of Stand- sprays. (Goulds Mnfg. Co.) 



ard size." (Maryland Ann. Rep. 13, 1899-1900.) 



Horizontal pumps are also used for very extensive work in 

 spraying. These pumps are in general more powerful than 

 the ordinary barrel pump and can accomplish more work. They 



are usually of sufficient strength 

 to operate several lines of hose. 



Various accessories are not 

 only desirable but almost neces- 

 sary to the successful use of 

 spraying apparatus. A number 

 of such accessories together with 

 different kinds of nozzles are 

 given in the accompanying fig- 

 ures. 



Special spraying apparatus 

 has been devised for various pur- 

 poses. Asparagus spraying has 

 FIG. 115 -- p wd ( e e |gett w ) ith attachments> been carried out successfully 

 against rust by a very complicated machine which will spray 

 several rows of asparagus at one time. (See N. Y. Ag. Ex. Sta. 

 Bulletin 188.) 



In barrel and all smaller pumps the power is hand power, 

 in the larger machines wheel gears and chains transform the 

 power from the wagon motion, while in still other cases, espe- 



