4 W. B. Rogers on Sonorous Flames. 
Those who are familiar with such experiments are aware that 
by the ordinary procedure a bulky flame of illuminating gas 
cannot be made to assume the sonorous state. Yet as might be 
expected when such a jet is mingled with a sufficient proportion 
of common air, it does not fail, with a suitable resonant tube, to 
yield a powerful musical tone. To bring about this result the 
air may be applied as a current to the surface of the flame, or it 
may be mixed with the gas below the place at which the combus- 
tion begins. As the effects of the former process will be shown 
under a subsequent head, I will confine myself to an exemplifica- 
tion of the latter as presented in the sonorous character of the 
large flame of mixed air and coal gas formed on top of a wire- 
auze burner, when properly adjusted. In the ordinary ar- 
rangement of such burners the proportion of air which becomes 
s powe 
which he uses in his gas stoves. On inverting one of these 
burners over the jet so as to bring the te Es cylinder below 
i increased. 
The sonorous state may be induced by giving a rapid motion to 
hen a jet of burning coal-gas is introduced into 
ube in a position in which it does not sing sponta- 
use it to commence its musical performance 
jetpipe rapidly from, side to side In, this 
