pipe to repair accidental breaks. 
Spraying for the Alfalfa Weevil. 14 
tees to gos for the hose connection with iis pump, or it may 
be built in two independent halves, each swung separateiy from the 
frame of the vehicle and supphed by a separate pressure hose from 
the pump. In case the pump has but one lead and another is desired, 
it may be provided by adding a T ora Y. The divided boom is more 
convenient than the other a driving through gates and, the parts 
being shorter, is less likely to be br deen on tough ground. 
The boom is connected with the pump by a rich: 5-ply or 7-ply 
pressure hose, to which it is joined by a hose coupler tee a $-inch 
‘pipe thread on one end and a }-inch hose thread on the other. The 
attachment of the nozzles to the boom is provided for by fitting 
each T with a $ by 4 inch bushing and a 4-inch nipple about 14 
inches long, which fits the 4-inch fernale thread of the nozzle. 
The booms whether in one piece or two, should not be expected to 
support its own weight. The best support is a 2 by 4, clamped or 
hinged to the truck, with the boom stapled, bolted, or wired to it. 
This prevents the slender pipe from whipping and breaking at the 
threads. The one-piece boom must be attached so that it can be 
quickly unfastened and removed when the outfit is driven through a 
gate. An advantage of the 2-piece boom is that the wings can be 
hinged so as to swing out of the way. 
ePwenty feet is the limit of length for the spray boom, owing to the 
amount of swinging at the aus caused by the w eee of the truck 
when moving over rough ground. Even when a shorter boom is 
used it is best to keep on hand one or two extra tees and sections of 
P THE NOZZLES. 
Plain nozzles, designed to give a misty spray, sometimes 
called hollow-cone, eddy-chamber, cyclone, whirlpool, and cover- 
spray nozzles, without strainers or. other complications, are 
best for this work, since the purpose is to place a fine, even coat- 
ing of poison upon the upper foliage, where the larve chiefly 
feed. This kind of nozzle has a base threaded to fit a 4-inch 
pipe. On the other end is screwed a brass cap which holds in place 
the steel discharge disk with its central discharge opening, and 
back of that a gasket 4 inch thick, within the circle of which is the 
eddy chamber or whirlpool chamber, which breaks the jet of water 
into a hollow cone of fine mist and gives the nozzle its various names. 
Back of this space is the directing disk, a flat piece of metal pierced 
with one or two holes situated midway between the center and the 
edge and slanted so that the liquid passing through them gives ¢ 
whirling motion to the contents of the eddy chamber. This disk 
should be removable from the body of the nozzle for cleaning, but it 
