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 foree 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 eountry, beeause labor is 
too high priced. For small areas, for experiment 
Fig. 72. 1, Eureka Knapsack (Boekel). 2, Success Bucket Pump (Deming). 
3, Common Bucket Pump. 4, Dart Bucket Pump (Gould). 5, Suecess Kerosene 
Bucket Pump (Deming), 6, Aquanette (Douglas). 7, Double-acting Aquanette 
(Douglas). 8, Handy eart 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 Foree Pump Co.). 2, Eclipse (Morrill & Morley).' 
3, Pomona (Gould). 4, Double Cylinder (Rumsey). 5, Geiger Pump. 6, Florida 
(Rumsey). 7, Columbia (Columbiana Co.). 
Fig. 75. 1, Victor Outfit (Field Force Pump Co.). 2, Caswell Sled Sprayer. 
3, Gaswell Geared Sprayer. 4, Wagon Outfit (Morrill & Morley). 5, Mounted 
Barrel Sprayer. 6, Eureka Tank Outfit (Morrill & Morley). 
