BURNERS. 

 Fig. 42. 



195 



The burners calculated for lamps exposed to wind, such as those in the 

 public streets, etc., and used without a chimney, are various in shape and 

 size ; they are known by the names of the bat's-wing, fish-tail, single jet, or 

 cock's-spur, double and treble jet, star, fan, and Scotch burners. The first of 

 these are usually employed in street lamps ; for the quantity of gas consumed 

 they give the least light of any, but seem to be very well adapted to their 

 purpose. The " cut," or narrow opening from which the gas issues, can 

 readily be cleared by a piece of watch-spring, an advantage, when a number 

 must necessarily be attended to by one man during a short space of time. 

 The quantity of gas they consume varies from five to six feet per hour. It 

 has been proposed to case-harden the nipples after they are finished, in order 

 to prevent the cut from opening. 



The other burners mentioned are of little importance, and need not be 

 more particularly described. 



To regulate the altitude of the flame from the burners, Messrs. Clegg and 

 Crosley, in 1817, applied a small governor to the outlet-pipe of the gas-meter. 

 It is useful in many cases, where the number of lights vary ; for if the open- 



2 c2 



