
29 
The barrel pump.—This is the commonest form of spraying appara- 
tus, and is supplied in many different styles; or, a suitable spray 
pump can be combined with an empty 50-gallon kerosene barrel with- 
out much difficulty. (See fig. 3.) This apparatus may be hauled 
about on a sled or in a wagon or a two-wheeled cart. 
Tank outfits—For larger operations it is much better to have 
a specially constructed rectangular or half-round spray tank of a 
capacity of 200 or 300 gallons. Such an apparatus enables an ele- 
vated platform to be mounted on the wagon and tank, greatly facili- 
tating spraying of the higher parts of trees, as indicated in the 
accompanying illustration (fig. 4). The ideal sprayer for extensive 
work combines such a tank, with platform, with gasoline or steam 
power spray pump. 

it iY why Werth 
Mf 3 Wert ‘: BRL aie 
i \ | aun 
ie h ee Me ae SN is Ati oN Ath Hay 
Fig. 4.—Power sprayer at work in apple orchard. (From Scott and Quaintance.) 

Geared sprayers.—For low-growing regularly planted crops it is 
sometimes possible to use spraying apparatus which gets its power 
by means of a sprocket wheel from the axle of the wagon. Several 
types of spraying apparatus of this kind are on the market, suited 
especially for the treating of crops like potatoes and strawberries, 
and the spraying of vineyards. In orchards it is not often possible to 
have the wagon constantly in motion, and geared sprayers are not as a 
rule available. ' 
Gas-pressure sprayers.—Some very successful spraying machines 
have been made which have as their motive power gas pressure. This 
pressure may be derived from compressed air or carbonic acid gas 
cylinders. It is an ideal way of applying liquid sprays, and has a 
127 
