146 



Journal of Agriculture , Victoria. [11 March, 1918. 



causing it to gyrate rapidly in the cylinder before escaping through the 

 orifice, which it leaves with a rapid spinning motion. Under the action 

 of centrifugal force the jet immediately opens out into a cup or tulip- 

 shaped hollow cone, the edges of which soon become disintegrated into 



No. 8. — Vermorel's Interrupter for Spray 

 Pumps. (From L. Fontaine in ' ' La Revue 

 de Viticulture." — 8th June, 1911). 



Fig. 9. — Jet and Nozzle fitted with Vermorel's Interrupter (after Fontaine). 



Fig. 10. — Jullian's Interrupter (section) (after Fontaine). 



Fig. 11. — Spray Pump Tube fitted with Jullian's Interrupter. A strainer to 

 prevent clogging of the nozzle is seen to the right (after Fontaine) . 



very minute drops, comparable to powder, whence the term pulveriza- 

 teur, by which spray pumps are known in France. The chief defect 

 of this ingenious nozzle was its liability to clog, owing to the smallness 

 of the aperture. This has been overcome in various ways; one of these 

 is shown in Fig. 7, which illustrates Vermorel's modification. 



