Acetylene Burners.
Owing to the deposits of carbon, it is necessary to construct burners for acetylene gas in a different and more substantial manner than those designed for coal gas.
Fig. 14.
The best arrangement is depicted in Fig. 15, which has a pilot-tube burner as well as the two main tips. On turning the key, gas is admitted to both main and pilot burners, but the electrode in breaking contact only ignites the gas at pilot burner, which, in its turn, acts as a lighter for the main burner. Turning the main burner out, the pilot light can be left burning if desired, giving a small light, it being not feasible to turn down the main burner owing to the before-mentioned carbonization.
Fig. 15.
The orifice of an acetylene burner is much smaller than that of a coal gas burner, the former burning about one-half foot per hour, against six or seven feet of the latter.