SPRAYS AND OTHER MEANS OF CONTROL 



1901 



are not too heavy nor too loiii; for tall 

 trees. The plain, thinibleii bamboo rods, 

 with wired ends, are seldom as durable 

 as the kinds mentioned previously, as the 

 bamboo is liable to split, and the rod 

 ends are more readily broken off. The 

 lining pipe and thimbles get loose and 

 turn around in the bamboo support, and 

 there is no satisfactory way to remedy 

 the defect. 



AukIo KIIs and Ys 

 Angle ells, like those shown in Fig. 

 21, but with base and top made hexagonal, 

 are more convenient than either the 

 round style (27), or the cast-iron angle. 

 (2S), which requires a pipe nipple in one 

 end before a nozzle can be attached. These 

 angle connections are used to change the 

 direction of the spray by making the 

 straight-hased nozzle, used alone or on the 

 plain Ys, almost face the perpendicular 

 when the extension rod is held in the 



position for spraying. Angle Ys can be 

 used in place of the angle ell of the plain 

 Y. When more than one nozzle is used 

 on a rod, straight nozzle should be used, 

 as the angle-base nozzles have to be forced 

 into position. When turned on tight, 

 angle-base nozzles rarely stand in the 

 correct position, while ftraight nozzles 

 are always standing right when used on 

 an angle Y, like that shown in (29) ; (30) 

 has the nozzle branches made too di- 

 vergent to be satisfactory, and cannot be 

 used in practical work. 



?rozzles 



Spray nozzles are readily divideil into 

 four classes, when separated according to 

 the different shapes of spray they form, 

 but on account of the extreme variation 

 or intermediate forms of spray which 

 some nozzles give, it seems the better 

 plan not to class them as hollow cone, 

 solid cone, solid stream, and flat or fan- 



I 



Fig. 21. C2') A r)ni--foiirth-lncli liiass ancle I., with r und liase and top which reqnli-i'S a pipe 

 wrench to hold it. A better type Is one with a hexagonal section at the hase and near the 

 top which can be t'lined with an ordinary wrench. (L'Hi A nnefourth-lnch cast-li-on L, 

 which retiulres a one-fourth-inch pijie nipple before a nozzle can he attached. It is lieavy 

 and soon becomes ccrroded. t~U} .\n angle Y. having braiu-hcs diverging jirojjerly, and 

 angled so that straight-based nozzles can be used. i.'iDi A straiglil V, witli ilic "nozzle 

 branches too divergent for use In practical spraying. 



