SPRAYS AND OTHER MEANS OF CONTROL 



1893 



Changing adjustments without knowing 

 why only means more trouble. 



7 Results depend upon thorough work 

 and the use of good standard brands of 

 spraying materials. 



ACCESSORIES 



The accessories are taken up in their 

 order of sequence, beginning with the 

 preparation of the spray and following 

 the liquid through its course until it is 

 delivered on the trees. Before the liquid 

 is poured into the tank it must always 

 be strained, unless one is looking for 

 trouble. 



Strainers 



Tank strainers, of the sloping-screen 

 type, clog if the liquid is not poured on 

 the upper end of the screen and allowed 

 to wash the sediment to the lower end. 

 A modification of the Stewart strainer, 

 in which the liquid passes upwards 

 througn the screen from below, combined 

 with the essential feature of tlie sloping- 

 screen type, is shown in Fig. 5 (1). This 

 type of strainer will not overflow under 

 ordinary conditions, will not clog readily, 

 and will usually drain out completely. 

 It possesses all the advantages of the 

 Stewart strainer with the additional value 

 of the sloping-screen type of tank strain- 

 er. The screen should be of heavy brass 

 cloth and have at least 14 wires to the 

 inch. Wire cloth having more than 24 

 meshes to the inch is not strong enough 

 to withstand the rough usage, and the fine 

 mesh fills up with sediment and is hard 

 to clean. A strainer of some kind is 



Fig. 6. (2) This kind of strainer will always 

 leave several inches of solution in the tank. 

 (3) A brass strainer with an easily replace- 

 able brass screen of large area. A strong, 

 durable accessory which permits practically 

 the complete emptying of the tank by means 

 of the suction hose. 



usually placed on the suction pipe or 

 suction hose, but some machines are equip- 

 ped with a metal box or well, attached 

 permanently to the botom of the supply 

 tank. This type permits the tank to be 

 drained completely and a simple, easily 

 cleaned strainer is enclosed in the well. 

 These are furnished with only a few 

 makes of machines. The usual types are 

 shown in Fig. 6 (2) and (3). 



Fig. 6 (2) and similar types always leave 

 an inch or two of liquid in the tank and 

 seemingly have no advantage over the 

 type shown in Fig. 6(3). The latter almost 

 completely drains the tank and seldom 

 clogs if it is at least four inches in di- 

 ameter. These strainers should always 

 be made of brass or some metal which 

 is not corroded by any of the spray 

 liquids. The iron strainers often seen 

 on barrel pumps are entirely too small, 

 and rarely last more than two or three 

 seasons, even if the machine receives 

 normal care. The screen on the suction- 

 pipe strainer should be readily replace- 

 able in case it is damaged in any way. 



Fig. 5. (1) A* home-made tank strainer of large 

 capacity, having all of the advantages of the 

 sloping-screen and Stewart strainers. 



op-n^ S«tre€^ Str«,n«. 



Fia. 



