CHAPTER NIX 
Spray Macuinery — GENERAL PRINCIPLES 
SEVERAL important considerations should be taken into account in 
the selection and care of spray machinery and appliances. Chief 
among these are the following: 
The spray pump should be of adequate size for the work for which it 
is intended to be used. As will be noted below, there are many different 
sizes and styles of pumps, ranging from the hand atomizer with a 
capacity of a quart or less of spray material, and suitable only for a 
very limited use, to the heavy power outfit fitted with a 200-gallon tank, 
and capable of throwing a stream 70 feet into the air. Either 
outfit would be absolutely unsuited to the work of the other. While 
these two examples are at the extremes, the same principle holds good, 
in lesser form, to other outfits that grade in between these two. It 
is poor economy to save four or five dollars on an outfit and expend 
several times that amount each season in extra labor and time. The 
first question to be decided, therefore, is that of the type and size of 
pump that will be best adapted to the work in hand. 
Whatever the style of pump decided on, it must be made of proper 
materials. Some of the spray solutions in common use have a corroding 
action on iron. The only material that will withstand their attack is 
brass or bronze, and eare should be taken to get a pump in which all the 
metal working parts that come into contact with the liquid are of heavy 
brass or similar alloy. This applies to the inside of the cylinder, the 
piston, the valves, valve seats, and any other submerged parts where 
close fitting is essential to the smooth and satisfactory working of the 
apparatus. 
Lately pumps have been placed on the market in which the inside 
of the cylinder is coated with a heavy, white enamel. If this is so 
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