DEVELOPMENTS' IN OIL BURNING. 



277 



Fig. 25. Conical bladed air impeller, air given a whirling motion but 

 directed away from axis ; reverse of last figure. 



Fig. 26. Venturi tube effect; air given a whirling motion by means of 

 flat bladed air impeller. Large impeller set at large diameter at entrance 

 of tube, and also in another experiment small impeller set at contracted 

 diameter of tube. 



lilt 



seifClfnc. poirT/OfJS. 



Fig. 22. 



Fig. 21. 



Fig. 27. Device for giving the air a whirling motion by delivering it in 

 a plane at right angles to the axis of the burner, tangentially to an air chamber 

 surrounding the burner tip. In this arrangement the air was given a whirl- 

 ing motion in a manner very similar to that by which the oil was given a 

 whirling motion inside the burner. 



w, i.coft/e Pi-Aceo 





Fig. 23. Fig. 25. Fig. 24. 



Fig. 28. Flat bladed air impeller giving the air a double twist, the outer 

 blades driving it one way and the inner blades driving it the other. Also 

 tried three sets of blades, the inner and outer sets driving the air in one direc- 

 tion and the middle set twisting it the other. 



