96 SPRAY APPARATUS 
Traction Outfits 
Traction sprayers derive their power from the wheels of the vehicle 
on which the pump and tank are mounted. They are especially useful 
in spraying grapes, potatoes, or other field crops; in other words, they 
are adapted to the kind of work in which one desires a continuous spray 
delivered constantly 
at a definite position 
orangle. Forspray- 
ing of this character 
they may properly be 
selected. For general 
orchard work they 
are not suited unless 
there is some ar- 
rangement by which 
the gearing may be 
disconnected and the 
pump operated by 
hand when desired. 
Outfits of this kind 
should always be pro- 
vided with a large 
air chamber, a pres- 
sure gauge in plain 
sight, and a relief 
Fic. 62.—A horizontal pump. Original. 
valve which will open 
at a certain pressure and allow the liquid to flow back into the tank. 
The capacity of traction sprayers is figured on the basis of a vehicle 
moving at the rate of 250 feet a minute, and ranges from 5 to 18 
gallons of liquid per minute. The connection to wheels is made by 
eccentric, chain, or gearing. 
Hand traction sprayers operate on the same principle, but are much 
smaller, are intended to be wheeled about by hand, have a tank of 
about 20 gallons capacity, and are so arranged that the pump may be 
thrown out of gear and operated in the same fashion as a barrel pump. 
