8 _ W. B. Rogers on Sonorous Flames. 
bring the air-jet closer to the opening of the tube at the same 
time that we augment the force of the blast. With a tube of - 
glass five feet long and two and a half inches in diameter and a 
a gas-flame Cae inches high proceeding from an aperture of j;th 
of an inch, I find it best to bring the argand jet a. little within 
es the tube. ‘Then by a gradually increasing blast I soon bring 
the flame to the.sonorous state and obtain a deep and powerful - 
organ-tone. 
In most cases the effect above described can be produced in a 
asec de but less satisfactory manner by using, instead of the 
d burner to conduct the current of air, a common glass 
ae tube bent suitably, and held near the jet-pipe below or just with- 
in the opening of the resonant tube. 
es To show that the mechanical action of the air upon the lower — 
a edge or the inner surface of the tube has n — effect in pro- 
ducing the musical tone, itis only necessary to the ex- 
+ after extinguishing the flame, when it will seen that 
- The current of sir alone gives nce to no decided ound, ee 
. ,of a due admixture of air in bringing on the sonorous 
tate is still more strikingly exhibited when we use a concentric 
si-pipe im which the current of air Ne through a central 
ap in the midst of an annular stream of gas. With such 
an arrangement and a = per force of init from the lungs or a 
uce a silent flame two or three inches in 
aes 
eee: re) ef exciting 8 sonorous ca provided the 
_bustible gases or vapors are brought to ns 
to form an Bee oh mixture, “and they 
Seplteation of Faraday which refers t asic 
duced in such cases to a rapid and sore suct 
explosions. 
a The intermissions of the singing fime are maite visible ry giv. 
| rapid vibrating or revolving motion—The intermitting — 
sr of the combustion in a singing flame has been beau- 
Prof. Tyndal by causing the light of the flame 
lving mirror from which it is reflected so as 
imilar : 
