1908.] PUBLIC DOCUMENT- -No. 73. l. r > ( J 



walls can be immediately washed down with clear water applied 

 from the lawn hose. For the same reason it is difficult to use 

 this kind of spray in cemeteries, although much can be done in 

 protecting monuments, etc., by covering with light-weight duck 

 cloth. 



The medium-weight outfits, with a 4 to 5 horse-power engine, 

 triplex pump and 300-gallon tank, seem to have the greatest 

 field of usefulness in the average city and town. They can be 

 used for both solid-stream and mist sprays, and with the exer- 

 cise of due care can be used in woodlands where the grades and 

 conditions of roads make it impossible to use the heavier spray- 

 ing rigs. These outfits are also most useful in treating orchards. 



The hand outfit of whatever type is the most expensive of all, 

 tested by cost of results, yet it will always have a field of use- 

 fulness in treating the odds and ends of spraying operations. 

 There are numerous small jobs of spraying to be done in every 

 citv and town, such as the treatment 'of fruit trees and back 



*/ 



yards, infested shade trees and shrubbery, or small orchards 

 where large power outfits cannot be economically used, and in 

 this work the small spray tank finds its greatest usefulness. 



The same considerations apply to the use of the gas sprayer, 

 where carbonic acid gas furnishes the pressure for the expul- 

 sion of the spray. With this outfit the saving of the labor of 

 one or two men at the pump is effected ; yet this in a measure is 

 more theoretical than actual, since the team transporting the 

 outfit requires a driver, and considerable attention must be given 

 to maintaining a constant pressure. A good point in connection 

 with this kind of spraying apparatus is its light weight, thus 

 making possible its use on hillsides, rocky ground, etc., where 

 the heavier power outfits cannot be used to advantage. 



Table of Theoretical Discharges. 



In selecting a spraying outfit and in planning for spraying 

 operations, it is often important to know the quantity of fluid 

 discharged or required to be discharged in a given time. The 

 principal factors involved in such a determination are pressure 

 and diameter of nozzle. 



The Goulds Manufacturing Company, O. D. Hogue, man- 

 ager, have kindly supplied this office with a table showing the 



