SPRAYS AND OTHER MEANS OF CONTROL 



1899 



withstand 200 lbs. pressure, is not prac- 

 tical to use, as it is too cumbersome, 

 being entirely too heavy for the operator 

 to drag around. Three-eighths-inch high- 

 pressure hose costs almost as much as 

 half-inch hose of similar quality, yet it 

 does not have sufficient capacity to supply 

 a cluster of large nozzles without greatly 

 reducing the nozzle-pressure of the spray 

 solution. The hose connections for this 

 size of hose have much smaller openings 

 than the half-inch connections, which 

 partially accounts for the reduction of 

 pressure at the nozzle cap. The lead of 

 hose to the operator on the ground should 

 be at least thirty-five feet long, but the 

 lead to the tower can be as short as 

 twelve feet without hampering the op- 

 erator in handling the spray rod. Barrel 

 pumps or large hand pumps will seldom 

 successfully supply more than one lead 

 of hose at a satisfactory working pres- 

 sure; but two nozzles can be used on the 

 spray rod, when one nozzle does not 

 utilize more than half of the capacity of 

 the pump. Fig. 17 (12), (13), (14) and 

 (15) shows a number of the various styles 

 of hose connections; the double-length 

 kinds, permitting the use of two hose 

 bands, are the only ones which should be 

 used. A connection having a hexagonal 

 nut of the form shown in (14) is supe- 

 rior to the round, coupling type (13). 

 The flange or a corresponding section of 

 the male hose connection should be hex- 

 agonal, as in (15), so that an ordinary 

 wrench can be used to turn it, and when 

 the connection at the base of the exten- 

 sion rod has one-fourth-inch pipe-thread, 

 as in (15) and Fig. 18 (16), the reducer 

 of the type shown in (17) is not needed. 



The Sherman hose-band, shown in (18), 

 is much superior to a wire or narrow 

 galvanized iron band, and is the kind that 

 is amost universally used. "Never-slip" 

 clamps, like those shown in (19), are 

 so built that the hose cannot be pulled off 

 of the connection by pressure. The hooks 

 on the clamp extend over the flange on 

 the connection and supplement the clamp 

 on the hose in preventing it from slip- 

 ping off of the connection. For power 

 sprayers this style of clamp and con- 



Fig. 18. (16) A one-fourth pipe-thread male 

 hose connection with a hexagonal section and 

 held by a single Sherman hose-band. This 

 connection is long enough to permit the use 

 of two hose-bands. (17) A reducer which be- 

 comes unnecessary when a one-fourth thread- 

 ed connection is used instead of a standard 

 male hose connection. (18) A Sherman hose- 

 band. (19) A Never Slip hose-clamp and a 

 double-length connection in position, The hex- 

 agonal nut is superior to the round kind 

 often furnished. 



nection is superior to any other kind, as 

 it is impossible to blow the hose off of 

 the connection by high pressure. 



Kod Cut-Offs 



The one-fourth-inch cut-offs, used at 

 the base of the spray rods, must have 

 sufficiently large openings so that the flow 



