Pumps and Nozzles. 361 



as many of the potato sprayers do, and those which 

 deliver it by the force of the pump. We have now 

 come to believe that the force of gravity is not 

 sufficient to do the work well, especially when Bor- 

 deaux mixture is to be used. Of the pump machines, 

 there are several kinds, as those which derive their 

 force from the suction of a piston and valves, and 

 those which work from the force of compressed air. 

 The accompanying illustrations (Figs. 70-75, pages 

 362-367) will show the reader some of the forms of 

 pumps which are now manufactured, and will per- 

 haps enable him to make an intelligent choice for 

 his purpose. It may be said that knapsack pumps 

 are very efficient, not only because they are power- 

 ful for their size but also because they enable the 

 operator to stand very close to his work ; but they 

 are not adapted to work upon trees nor, in fact, 

 upon large areas in this country, because labor is 

 too high priced. For small areas, for experiment 



Fig. 72. 1, Eureka Knapsack (Boekel). 2, Success Bucket Pump (Doming). 

 :{, Common Bucket Pump. 4, Dart Bucket Pump (Gould) . 5, Success Kerosene 

 Bucket Pump (Deming). 6, Aquanette (Douglas). 7, Double-acting Aquanette 

 (Douglas). 8, Handy cart rig. 9, Cart Sprayer (Field Force Pump Co.). 10. 

 Economy Garden Engine. 



Fig. 73. 1, Barrel Pump (Field Force Pump Co.). 2, Barrel Pump (Douglas). 

 3, Columbian (Douglas). 4, Double-acting Pump (Gould). 5, Nixon Tripod 

 Pump. 6, McGowen's Automatic Poison Injector. 7, Clock Pump, and Dash 

 Agitator (Gould). 8, Bean Pneumatic Pump. 9, Myer's Lever Bucket Pump. 

 10, Barrel Agitator (Gould). 11, Maud S. Pump (Maud S. Co.). 



Fig. 74. 1, Empire (Field Force Pump Co.). 2, Eclipse (Morrill & Morley). 

 3, Pomona (Gould). 4, Double Cylinder (Rnmsey). 5, Geiger Pump. 6, Florida 

 (Rumsey). 7, Columbia (Columbiaua Co.). 



Fig. 75. 1, Victor Outfit (Field Force Pump Co.). 2, Caswell Sled Sprayer. 

 ''>, Caswell Geared Sprayer. 4, Wagon Outfit (Morrill & Morley). 5, Mounted 

 Barrel Sprayer, fi, Eureka Tank Outfit (Morrill & Morley). 



