SCIENCE AND INDUSTRY. 
produces a more even discharge whether solid or hollow. In this way 
many of the slight imperfections in the nozzle are overcome. The 
thickness of the directing disc has an important influence on the dis- 
tribution. A thin dise increases the angle, and also causes the spray 
particles to be smaller, or gives a finer deposit. 
SECTION OF SPRAY NOZZLE.—DISC TYPE. 
C. Cap; C.A. Central Aperture; D. Disc; D.D. Directing Disc; 
B.P. Basal Plate; E.C. Eddy Chamber; O. Orifice; R. Reservoir; 
O.S.H. Oblique Supply Hole; P. Post; W. Washer. 
Tt will readily be seen from these brief details how the nozzle may _ 
be the cause of success or failure in spraying. It would pay the grower 
inany times over to have several nozzles, each selected for its own 
special use, and also in cases of accident to his only nozzle in .the 
midst of urgent work. There is no doubt that, at the présent time, the 
growers are in need of much enlightenment on the subject, and much 
useful co-operation could be effected by the State Departments of 
Agriculture and the Commonwealth Institute of Science and Industry 
in the matter of standardization and regulation of all insecticides, 
fungicides, soil fumigants, animal washes, and dips and powders, and 
the collection and distribution of information on spraying equipment, 
and especially nozzles. 
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