28 



tanks usually hold í'rom one hundred and fifty to two hundred 

 gallons or 570 to 760 litros; the pump varíes from one and one 

 half to two and one half horse power and the capacity per 

 day ranges in the neighborhood of eight hundred to fifteen 

 hundred gallons or 3050 to 5700 litres. At the present, 

 gasoline is the common engine fuel in use. The 

 frame upon which the engine is mounted should be 

 firm and strong, that the vibrations may not rack it and the 

 heavy parts of the machine should be mounted as low as possi- 

 ble to prevent overbalancing. Engines air cooled or requiring 

 a small chamber of water for cooling are to be preferred to those 

 requiring a large quantity of water. A very commendable 

 t'eature possesed by some of the pumps is an apparatus for 

 automatically ungearing the pump from the engine when the 

 pressure reaches a certain point and when the pressure is re- 

 duced allowing the power to return gradually. If there is 

 danger of the spraying mixtures blowing back on the rig, the 

 pump and engine should be covered. A very good protection 

 is a platform above, from which canvass curtnins are dropped. 

 As previously stated this type is most satisfactory for 

 orchard work but to próvido onoself with such a machine is only 

 practicable where the acerage is large and one or more sprayings 

 annualy are requirod. Probably 20 acres of bearing trees should 

 be set as the smallest amount that should justify the purchase of 

 a spraycr of this type. The cost of the engine and pump 

 withont tank or mountings is ¿150.00 or $200.00. Usually it is 

 found to work lo the best advantage to carry two Jnes of hose 

 with one man for each to direct the nozzles while a third man 

 attends the engine and drives the team. 



HAND SPRAYERS 



As the ñame signifies, the vorking pressure for this class of 

 sprayers is furnished by hand. A large vaiety of sprayers, term- 

 ed hand machines, are on the market, the following illustrations 

 being selected to represent the several general types. 



