384 Report of the Horticultural Department of the 



Barrel outfits are constructed on the same principle as knapsack 

 sprayers, but in these the oil tank is generally inside the barrel, except 

 in the case of the Spramotor outfit. 



An example of the former is Gould's Kerowater barrel outfit, 

 shown in Fig. 49. The Spramotor outfit is shown in Fig. 50. In 

 outfits having pumps each for oil and water the percentage of oil is 

 varied by changing a pin in the lever of the pump of the oil tank at 

 its attachment to the other lever. In outfits in which only one pump 

 is used, the kerosene tank is connected with the pump by a suction 

 pipe and the proportion of oil is controlled by a valve in the kerosene 

 tank. This valve is connected with the indicator on top of the tank 

 by a rod. The Goulds Mfg. Co. makes a large " Kerowater " in 

 which a large horizontal water tank is used and the oil kept in a 

 barrel on top of it. The pump is mounted on a tripod. The action 

 is the same in principle as in the barrel "Kerowater" put out by 

 the same company. 



Very few, if any, of the pumps designed for spraying kerosene and 

 water uniformly apply the desired proportion of oil as shown by the 

 indicator. This may account for some of the injury that occurs when 

 these pumps are used. 



DUST sprayers. 



The term " dust sprayers " has recently come into popular use for 

 designating those machines by which either insecticides or fungi- 

 cides are applied to plants in the form of dry powder. The idea of 

 treating plants with powders in this way is not new. The practice 

 of applying sulphur, paris green or other dry powders, to field, 

 garden and greenhouse crops either by means of bellows or of so- 

 called " powder guns " has Ions: been known both in America and in 



