\ i.! .1 I 11 |\|)l w INSKi TS, ETC. h II V.P. XI. 



to the plants, so that the whole attention can be given to the 

 application oi the spray and both hands an- free to direct it pro- 

 perly. This is a verj important point, as thoroughness in spraying 

 iv absolutely essential to success, and if most oi the energy and 

 attention ol the operatoi is occupied with the physical labour of 

 pumping, it is obvious that a really satisfactory application of the 

 spray ran hardly be expected. For this reason alone. Pressure 

 Sprayers have a verj considerable advantage over the old patterns 

 of hand sprayers. The pump, by which the necessary pressure is 

 attained, may be contained in the sprayer or may be separate. In 

 the latter ease a saving in weight is claimed but against tins must 

 be placed the greater risk of breakage or mislayalof the pump and 

 the weight of this is very trifling in comparison with the weight of 

 the tank and other necessary parts. For this reason, preference 



Fig. 51. " Vuti i pi aj " in use. 

 ■ that onlj one hand i required to direct and control the spray. 

 (Authoi ori| inal photo 



ma J be given to those patterns in which the pump is sell-contained. 

 Some models are provided with pressure-gauges to indicate the 

 correct amount ol pressure to which the air should be pumped; 

 although such gauges are of course useful it is doubtful whether 

 thej are worth paying much extra for in India where tin ordi- 

 nary cooly is not likely to work up too great a pressure. In 

 those types which arc not fitted with a gauge it is usually 

 fairly easy to tell when the pressure is sufficient as the ini I 



difficulty in pumping in more air acts as a commonsense indi< ator. 



