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not in use, and for facilitating the removal of any clogging of 
nozzles set without loss of time, waste of material, and deluging the 
workmen, 
The hose should be strong, }-inch inside, three or four ply and 
of good quality. A smaller diameter would cause too much friction 
a larger one would make the hose very heavy when full of material. 
With Power sprayers have plenty of length of hose, about 30 feet. 
The hose should be well washed, especially after using oil sprays. 
It is a source of annoyance that universal gauge threads for the 
interchanze of fittings are not used by all makers, as in the case 
of microscopes. 
Power Sprayer. 
The selection of Nozzles depend on the pressure exerted by the 
pump. The Vermorel type of nozzle used in connection with the 
knapsack which displays a pressure of 50 to 75lbs. to the square 
_inch, is very satisfactory. They deliver the spray in the form of a 
cone and give a fine spray even with a low pressure. 
In general the higher the pressure the more efficient the spray- 
ing that may be done with any form of nozzle. 
The Bordeaux type of nozzJes which give a fan-shaped spray, 
are better suited for Power Pumps working under a pressure of 
100lbs. to the square inch and over. 
Dusr SPRAYERS. 
Mechanical ingenuity has devised appliances for the even 
distribution of impalpable powders as well as for the spraying of 
liquids ; amongst these is the machine here illustrated. 
