SPRAYING AND SPRAYING APPARATUS. 127 



pounds. With the lime-sulfur wash iron parts last longer 

 than brass parts, but any kind of metal will wear rapidly, since 

 this compound contains much grit on account of the large quan- 

 tities of lime used in making it. 



Air Chamber. All spray pumps should be provided with 

 an air chamber of liberal size. This equalizes the pressure 

 between the strokes of the pump, thus giving a more even flow 

 of spray from the nozzle and easing the strain on the hose. 



Nozzles. Most of the nozzles now in 

 use have a chamber, known as the "ed- 

 dy chamber," underneath the nozzle-cap, 

 with the entrance into the chamber so ar- 

 ranged that a rapid, whirling motion of 

 the liquid results and causes the liquid, 

 if under proper pressure, to break up and 

 leave the nozzle in a very finely divided, 

 mist-like condition. There are a number 

 of types of nozzles, but the amateur will 

 probably have the best success by using 

 nozzles of the Vermorel typ-e. Where 

 sufficient power is available, as with 

 gasoline engines, two or more poles may 

 be run from one pump, each pole bear- 

 ing from two to four nozzles. 



Clogging of the nozzle may result 

 from several causes. The most common 

 is improper straining. The spraying 

 mixtures should always be strained, 

 when run into the spraying barrel or 

 tank, through as fine a mesh as possible. 

 For lime-sulfur wash about twenty meshes per inch must be 

 used because a smaller mesh fills up badly. For most other 

 sprays a mesh as small as twenty-five per inch should be used if 

 possible. A much finer mesh can be used when the strainer is 

 made with the wire mesh on the sides as well as on the bottom 

 because this allows the liquid to continue to pass through the strain- 

 er when the bottom has been covered with sediment, as frequent- 

 ly occurs with lime-sulfur wash. The mesh should be of brass 

 or copper. Whenever burlap is used for holding the dissolving 



Fig. 58. Bucket 

 pump outfit. 



