134 
knapsack-sprayer, shown in Fig. 73. This is a very con- 
venient arrangement. It can be readily carried anywhere, 
and when on the back, is easily shaken so as to keep 
the liquid well stirred. ‘The knapsack-sprayer shown in 




























































Fig 73.—Knapsack-sprayer with kerosene tank. 
the figure, has an attachment by means of which kerosene may 
be mixed without the trouble of previously preparing an 
emulsion. The small tank is filled with kerosene and the larger 
one with water. A stop-cock with a graduated scale over which 
its handle moves, allows the two liquids to come together in 
or near the nozzle in any proportion, from three to fifty per 
cent of kerosene. | 
A very important part of the spraying-outfit is the nozzle, 
and a great variety of these are now in the market. There are 
nozzles that throw a solid stream (good for watering lawns and 
washing carriages), and some that produce a very fine mist; 
some have a fairly long range and others work only at a short 
distance. Others again throw a fan-shaped spray and still 
others a spray in the form of a funnel. Many clog easily 
but a few are self-cleaning. Among all these nozzles the 
qualities that are desired are evenness of distribution, economy, 
freedom from clogging, and the production of a fine spray 
which issues with great force, as a spray should strike the 
