The Trials of Spraying Machines at Cambridge. 461 
pipe of the pump, made of f india-rubber hose, armoured, leads 
to the distributing pipes, being connected with them by a union 
joint. 
From the flow-pipe of the pump a small tube with a tap is 
earned into the barrel, and supplies, at pleasure, a strong jet of 
liquid, which impinges on the strainer inside the barrel and 
agitates the liquid thoroughly, and at the same time keeps the 
holes of the strainer free from particles. This is an ingenious 
and most valuable feature of the machine. 
Pipes for distribution are fixed upon long horizontal arms, 
extending about 6 feet beyond the wheels on either side. On 
these are fixed 7 steel shields, which hang down between the 
rows of potato plants to within 8 or 10 inches of the gi’ound ; 
a pair of nozzles on each shield are arranged to distribute the 
liquid right and left under the leaves of the plants. 
The shields can be adjusted to suit various widths of rows, and 
Fig. 1.— Strawsons’ Potato-spraying Mac'uine. 
the nozzles can be set at any angle. The nozzles, which are 
like those known as Vermorel’s nozzles, are well suited for 
distributing the Bordeaux mixture, as their spray forms a thick 
mist. 
When the potato plants are very thick and high, making it 
difficult to spray the under surfaces, the whole of the shield 
arrangement can be quickly elevated high enough to spray the 
tops of the plants alone. 
As there is naturally a thick sediment from the lime used in 
the Bordeaux mixture, it is essential that distributing machines 
should be furnished with perfect strainers. The Strawsons’ 
machine has three strainers in succession. One is on the end of 
-the suction hose, another is fixed in the hopper on the tap of 
