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DEVELOPMENTS IN OIL BURNING. 



The idea of delivering the oil tangentially to a chamber inside the nozzle 

 is shown in a burner patented in England by Mr. Albert Edward Jones, in 

 1907 (Fig. 5). This invention as a matter of fact contemplates the use of a 

 gas or vapor in combination with a combustible liquid, and is not strictly 

 what we consider a mechanical atomizer, but the device is almost a dia- 

 grammatic illustration of the tangential principle and for that reason I have 

 reproduced it here. It may be considered that oil is forced into both tangen- 

 tial passages, or that only one is used, thus depending only on the whirling 

 motion of the oil to cause the spraying. 



A so-called "nebulizer of the heavier hydrocarbons," patented in this 

 country in 1908 by Stringham and Elmendorf, is a good illustration of the 

 further development of the tangential principle and is shown in Fig. 6. This 

 apparatus was water-cooled, a precaution not found necessary in connection 

 with boiler furnaces. 



Fig. 6. — Stringham-Elmendorf NEBUi<izeR. 



Modifications or combinations of the tangential and helical forms of 

 burners are frequently encountered in the art, and an illustration of one of 

 these is shown in Fig. 7. This is an ingenious burner patented in England 

 by Sir John Thorny croft in 1906, in which it will be noted that the oil pas- 

 sages within the tip are made variable in area of cross-section by an adjust- 

 ment of the spindle, thus varying the quantity of oil delivered without alter- 

 ation of either oil pressure or size of outlet passage. This renders the 

 burner adjustable like the Howden, though by a different process, in that in 

 the Howden burner the helical passages remain unaltered and only the outlet 

 orifice is changed. 



