Mar. so , 1916 
A New Spray Nozzle 
1179 
right-hand nozzle is of the common type where the streams impinge 
squarely. The middle nozzle is of the new type, but not strictly com¬ 
parable with the former, since the streams come together at a broader 
angle, making a wider spray. Indeed, when the spray is under full 
pressure (PI. LXXXVI, fig. 1) the spread is too wide, producing a 
lateral dribble and marginal fringe of spray. The left-hand spray is 
intermediate in angle and spread and gives the fish-tail effect. 
The contrast is shown from the first illustration, the fish tail having 
thick marginal zones and the other two thick central zones, much shorter 
in the middle nozzle. In Plate LXXXVI, figure 1, where the spray 
sheets assume their normal proportions under high pressure, the large 
size of the white patch in the middle corresponds to the better final dis¬ 
tribution of the spray particles. The irregularity of the spot shown on 
the left of this white patch is due to an irregularity in the orifice on the 
opposite side. 
In Plate LXXXVI, figure 2, which shows the result of a sudden de¬ 
crease of pressure, the character of the water sheets becomes especially 
evident, since they are increased greatly in size and the production of 
spray almost ceases. 
ADVANTAGE OF A FLAT SPRAY 
The cyclone nozzle leaves nothing to be desired in the way of fineness 
and uniformity of spray, but it has the disadvantage of making a ring 
of spray which surrounds instead of touching the object towards which 
the nozzle is directed. It is very difficult for one handling the nozzle 
to keep in mind the fact that the spray is strictly limited to the visible 
parts of the cone. A flat spray, on the other hand, reaches the point 
aimed at and is more available for treating branches of trees, for exam¬ 
ple, where the desire is to concentrate the spray on a line. For general 
spraying also the use of a flat spray, like the use of a flat brush for paint¬ 
ing, gives uniform results more quickly and easily. For these reasons, 
while no other nozzle on the market produces a flat spray comparable in 
quality to the spray produced by the various types of cyclone nozzles, 
they are, nevertheless, more extensively used than the cyclone nozzles. 
ADVANTAGE OF UNIFORMITY AND FINENESS 
The use of nozzles of the flat type is generally acknowledged to be 
for the purpose of securing the flat shape of spray fan and is not a rejec¬ 
tion of the principle that a uniformly fine spray is the most desirable. 
In fact, the use of these nozzles is generally associated with the use of 
high pressures, whereby the defects of a poor grade of nozzle are less 
apparent. The particular advantage of fineness is that it makes possible 
the even distribution of the spray material. 
Fineness involves evenness. In a nozzle giving coarse drops, part of 
the material is in a finely divided state, and the improvement in a spray 
