ON THE DEVELOPMENT OF LIGHT FROM CO.VL G.\S. 



249 



Another form of street burner — a 'double-flame' burner— is made by 

 them. This is formed by two burners being so placed that the flames from 

 the two join together a little above the burner. We have not had an 

 opportunity of testing the latter burners, but the large ' standard ' burners 

 have been tested with 16-candle gas at pressures of 0"5 inch, 8 inch, and 

 1-0 inch, with the following results, which, it will be seen, arc higher than 

 those obtained with the standard Argand burner : — 



Silber makes flat-flame burners in three forms — single, double, and 

 triple batwings. A wedge-shaped piece of brass is inserted between the 

 heads of the two latter burners, for the purpo-se of directing air currents 

 to the flame. The body of the burners in each case is large and vase- 

 shaped. The results obtained by testing these burners are given in the 

 following table : — 



Silber's Flat-flame Burners — Single, Double, and Triple Batwings. 



I 



The double and triple burners do not give good results excepting 

 at the higher pressures. The double ones give smoky sluggish flames at 



