276 



DEVELOPMENTS IN OIL BURNING. 



Fig. 18. Cast-iron truncated cone, with slots cored in the side so arranged 

 as to give the air a whirUng motion. It was tried with the end closed and 

 all the air passing through the slots, and also with the end open, some of the 

 air passing through the slots and some through the end of the cone around 

 the burner. The burner was located at the end of the cone as shown in 

 the cut, and also pushed in to the inner end of the cone, and also in interme- 

 diate positions. The whirling motion of the air obtained with this arrange- 

 ment is of a different character from that obtained with the impeller plate. 



Figs. 19 and 20. Truncated cones made up of concentric rings of sheet 

 iron, with air passages between them, and so formed as to direct the air 

 toward the axis. The angle of the first set of rings was 7^ degrees and 

 that of the second set, 15 degrees from the axis. No whirling"motion. 



aee.rieN.fl.tl. 



nmiufi apifni. motioh 

 Fig. 18. 



Figs. 19 and 20. 



Fig. 21. Truncated cone of sheet iron, no air openings in the side but 

 air admitted at both ends, as shown by the arrows in the illustration. No 

 whirling motion. 



Fig. 22. Flat disc or plate of sheet iron placed on fire-room side of burner 

 tip to produce effect of directing the air to the oil spray as shown by the 

 arrows. Plate tried in various positions, also removed entirely. No 

 whirling motion. 



Fig. 23. Sheet-iron cone placed over burner tip to direct air to spray 

 as shown. Tried in various combinations with regard to burner tip and 

 opening to furnace. No whirling motion. 



Fig. 24. Conical bladed air impeller, air given a whirling motion and 

 directed in toward axis. 



