DEVELOPMENTS IN OIL BURNING. 



281 



being varied entirely by controlling the oil pressure and temperature. This 

 burner is fitted with a yoke and hand screw which holds it in position and 

 provides a ready means for disconnecting. 



The air distributer is a truncated cone provided with longitudinal slots 

 or openings which may be varied in area by means of a cover or register 

 revolving on the outside and regulated by suitable mechanism. The air 

 does not receive a whirling motion, the mixture with the oil spray being 

 obtained by carrying a high air pressure and forcing it through the restricted 

 area of the slots at high velocity (Fig. 36, Plate 98). 



Fig. 35. 



Fore River (Fig. 37). — ^An adjustable spindle in this burner is arranged to 

 throttle or close the outlet orifice and to vary the size of the central chamber 

 to which the oil is delivered through two tangential ducts, and the burner is 

 provided with a quick detachable arrangement for holding in place. 



Fig. 37- 



The air distributer is a cone provided with air slots in the side which 

 give the air a whirling motion, the area of these slots being controlled by 

 regulating mechanism. The angle of the cone is about 60 degrees, which is 

 much greater than that of any of the designs above described, and another 

 difference lies in the fact that all the air enters through the slots and none 

 around the burner. The slots, besides being so arranged as to give the air a 

 whirling motion, are greater in area in the direction of the furnace. 



