344 Report of the Horticultural Department of the 



a pressure of from 70 pounds to 80 pounds. Herein lies one advan- 

 tage of so-called " power " sprayers. With these a greater pressure 

 may easily be maintained than it is practicable to keep up with any 

 hand pump. 



The character of the spray is determined not only by the amount 

 of pressure but also by the kind of nozzle. No form of nozzle has 

 been devised which gives a better spray than those constructed on 

 the principle of the Vermorel. With such nozzles a fair spray may 

 be had with even 50 pounds pressure. Much profitable spraying 

 has been done with them with no higher pressure than from 50 to 

 60 pounds. Nevertheless w'ith double that pressure a much better 

 spray is obtained. 



There are other forms of nozzles with which a spray may be 

 thrown to a greater distance than can be done with nozzles of the 

 Vermorel t}pe. On this account they may sometimes be used to 

 advantage but generally speaking it is not good economy to use 

 them. It is better to use a nozzle made on the same principle as 

 the Vermorel and to devise some way of getting it close to the foliage 

 which is to be reached by the spray. This may be done by exten- 

 sion pipes or rods or by putting towers on the spraying rig from 

 which the high tree tops may be reached, or by a combination of 

 both methods. 



For further discussion on these points see under Nozzles, Exten- 

 sion Rods and Towers. 



SPRAY MACHINERY. 



TRADE CATALOGUES CONSULTED. 



In preparing this bulletin we desired to have before us accounts 

 of the most recent devices in spraying apparatus and therefore sent 

 requests to many manufacturers for information concerning their 



