362 Report of the Horticultural Department of the 



The bucket outfits are very useful in small g-ardens or for treating 

 trees, shrubs, etc., about the dooryard. 



KNAPSACK OUTFITS. 



The knapsack outfit is well adapted for use in small plantations 

 such as gardens and greenhouses, and in those that are inaccessible 

 to outfits on wheels. 



The pump of a knapsack sprayer is generally readily detachable 

 from the tank for convenience in cleaning. The point at which the 

 plunger leaves the tank should be guarded by some device for pre- 

 venting the liquid which will be drawn up from running down on the 

 back of the operator. The handle may be operated only from one 

 side, or may be reversible. If reversible it may be changed by the 

 mere act of turning or it may be necessary to change a link or pin. 



Theoretically the knapsack sprayer does not need an agitator as the 

 motion of the body of the operator would be expected to keep the 

 mixture sufficiently mixed ; but in practice the use of an agitator 

 gives better results with mixtures having heavy ingredients such as 

 bordeaux mixture and paris green. For this purpose either the jet 

 or the swing form is used. 



The Hardie knapsack apparatus, a peculiar form of the knapsack 

 sprayer in which the pump is separate from the tank, is shown in 

 Fig. 16. 



HAND carts. 



Hand carts are adapted for commercial work only in a small way. 

 They are principally recommended for use in gardens and in places 

 inaccessible to wagons. Their capacity is generally about 30 gallons, 

 but may be 50 and in the wheelbarrow outfits is only 10 gallons. The 

 construction of these outfits is sufficiently well understood by refer- 

 ence to the illustrations. A wheelbarrow outfit made by the Hardie 

 Co. is shown in Fig. 17 and a two-wheeled truck and barrel sprayer 

 put out by the Field Force Pump Co. in Fig. 18. 



