SPRAYING MACHINERY 127 



of these three conditions is absent, however, as when 

 trees are large, the ground rough, or very careful work 

 is necessary, some other form of power is better. 



Engine Power Sprayers Steam engines have occa- 

 sionally been used in spraying. As a rule they are not 

 to be recommended. Still occasionally there is a farm 

 on which a small steam engine is already owned, and 

 where the men know how to manage it. Where the 

 land is reasonably smooth, and a fairly light mount 

 can be secured, the steam engine may prpve satisfac- 

 tory. 



Gasoline motors come more nearly meeting the spe- 

 cial requirements of the apple grower who wants to 

 spray his trees. There are several manufacturers who 

 are putting such outfits on the market. Each machine 

 consists of a gasoline motor, of about two to three 

 horse power, more or less conveniently mounted on a 

 truck with a two-hundred gallon tank. The gasoline 

 engine or motor is comparatively simple and easy of 

 management, so that a really intelligent farm hand can 

 usually make friends with it. It may as well be ac- 

 cepted at the beginning of things that an ignorant and 

 heedless hired man cannot manage a spray outfit. 

 The gasoline motor has one practical advantage which 

 strongly commends it to many farmers ; viz., it can be 

 used for many other purposes when the spraying is 

 not going on. It will saw wood, cut silage, pump 

 water or run the milking machine. 



Compressed Air Sprayers In this form of machine 

 two air-tight metal cylinders or tanks are mounted side 

 by side on the truck. One of these cylinders holds the 

 spray liquid ; the other is charged with compressed air. 

 In order to charge this cylinder some stationary form 

 of power is required, as a horse power, water power, 



