124 BULLETIN 173, U. S. NATIONAL MUSEUM 



The air leaves the fan through an annular passage surrounding the 

 atomizing cup so that the swirl of oil from the cup mixes intimately 

 with the swirl of air. This old burner is rated at a capacity of 2 

 to 8 gallons of oil an hour. It has a 1/3 -horsepower motor. 



The burner was in use from 1914 to 1936, when it was removed 

 from service for presentation to the Museum. 



BABCOCK AND WILCOX MECHANICAL OIL BURNER, 1929 



Plate 26, Figube 2 



U.S.N.M. no. 309878 ; original ; presented by Babcock & Wilcox Co. ; photograph 

 no. 13477A. 



This burner, known as the Lodi design, consists of a mechanical 

 atomizer element and an adjustable air register. The atomizer ele- 

 ment consists of a gooseneck connector body, which incloses a 

 strainer, an extension tube, a sprayer plate, and a tip. Oil heated 

 to the proper fluidity enters the element under pressure furnished by 

 the fuel pumps and leaves the sprayer plate and tip in the form of 

 a hollow cone of very finely atomized oil. 



The air register consists of a cylindrical air chamber, the rim of 

 which is composed of hinged, adjustable air doors, which automati- 

 cally close in the event of a furnace explosion or flare-back. The 

 furnace side of the air chamber connects to a cast-iron spiral-bladed 

 air cone converging toward the furnace. Concentric with the air 

 cone is a conical center impeller placed with its blades surrounding 

 the tip of the atomizer. Air control is by means of the adjustable 

 air doors and by adjusting the position of the atomizer and center 

 impeller in the air cone. 



The burner is designed for natural or forced draft. Its capacity 

 is 1,500 pounds of oil an hour. 



METTLER GAS BURNER, 1930 



U.S.N.M. no. 310203 ; original ; gift of the Lee B. Mettler Co. ; not illustrated. 



This is a low gas pressure, atmospheric air pressure, multijet, 

 multiunit type of gas burner. It consists of a number of tubes within 

 which the gas and air are mixed, heated, and ignited. The tubes are 

 holes formed in a thick refractory block that protects the gas mani- 

 fold from the heat of the flame and provides an incandescent zone 

 at the mouth of each tube, which heats and ignites the mixture. 

 The. gas is supplied under pressure to each tube through four jets 

 impinging at a central point within the tube with a resulting agita- 

 tion and mixing of the gas and air within the tube. The. air is drawn 

 into the furnace through the tube by reason of the draft within 

 the furnace. It is claimed that the burner effects complete combus- 



