248 
Methods of Preventing and Checking 
mologists.' The pump of this macliine is very powerful, capable 
of being worked to a pressui-e of 100 lb. on the square inch, 
with a moderate amount of hand power, though 50 to GO lb. 
Fio. 20.— The Stott patent sprayer. 
pressure is sufficient. It sends fine mist to the height of 20 
feet, and a single stream from 40 to 50 feet high. A short 
'• delivery hose with a small nozzle is inserted in the tank to 
keep London Pui-ple, Paris Green, and other mixtures uniformly 
suspended by continual 
u^. agitation." Hose to the 
length of 30 feet can be 
fitted to this pump, and 
an arrangement of brass 
tubing 6 feet 3 inches 
in length convenient for 
high trees. 
The figures (21 and 
22) show the pump 
working from a pail, 
and attached to a garden 
engine. 
There are many 
other machines in use 
in the United States 
and other countries. 
Some are very elaborate 
and expensive ; some 
are fearfully and won- 
derfully made ; others 
are simple and cheap. 
The most practical and 
Fio. 2i.-Pumi, .letaciiei. uscful, liowever, liave 
been described here, 
and it is believed tliey will be found to work satisfactorily. The 
Strawsouizer and other horse washing machines have not been 
' This can be obtained of Messrs. Hemmingway, 60 Mark Lane, London, 
