Spraying Devices and Machinery. 



205 



FIG. 22. Hand bellows for blowing- powders. 



was fastened a small reservoir for holding the material 

 (Fig. 22). Bellows are easily operated, distribute the powders 

 evenly, and in ad- 

 dition are cheap, 

 so they are still 

 very commonly 

 used, in modified 

 and improved 

 form, both in Eu- 

 rope and in this 

 country. When 

 large areas are to 

 be treated, however, the work progresses but slowly, and this 

 has led to the invention of machines which force a current of 

 air through a tube by means of a revolving fan, the powder 

 being mixed with the air. A type of this class of machines is 

 shown in Fig. 23. Their action is certain and rapid, and 

 although they are more expensive, their greater effectiveness 



well warrants the outlay. 

 The first powder gun made 

 in America appears to have 

 been invented by Legget, 

 who began its manufacture 

 as early as 1854. 



Another advance was 

 made in 1895, when there 

 was advertised a horse- 



FIG. 23. Gun for applying powders rapidly, power machine called the 



" Sirocco Dust Sprayer." 1 



A powerful air blast is produced by gearing a revolving fan to 

 the main wheels, and large amounts of any dry powder may 

 be quickly and evenly distributed. 



IV. COMPARISON OF LIQUIDS AND POWDERS. 



Having thus very briefly discussed the gradual introduction 

 and development of the machinery used in making applications 

 of insecticides and fungicides, it now remains to discuss the 



1 The Sirocco Company, Union ville, Lake County, O. The device was invented 

 by W. R. Monroe. 



