_ the flame of a current of air of definite amount and velo 
: woith as ieee ser cote and ease as an a gexflame, 
Ww. B. Rogers on Sonorous Flames. 3 
peratures and may be used from time to time for several anys 
without replenishing. 
Finding that the ordinary solid wick gave such ciiaaiuactsry 
results even with an ether flame, it occured to me that a hollow 
wick by its larger exposure to the air would be more vert 
to the Ritination of the explosive mixture, and therefore to the 
roduction of the sound. This, on trial, proved to be oy fact. 
by using hollow wicks, and resonant tubes but slightly exceeding 
hem in diameter, I was able to obtain the musical with 
the flames of sulphuric ether, common alcohol, and the se toes 
of the latter with spirits of turpentine, which is known in a 
country as burning fluid, and by employing an iron tube at 
high temperature with such a hollow vice I have obtaiibe 
be less perfectly, a iehacal note from the flame of sperma- 
ti 
These results may be readily obtained with the flame of the 
small circular-wick lamp now in use for burning the mixture of 
aleohol and turpentine. In this form of lamp the wick-tube 
rises about two and a half inches above the reservoir, and an 
external movable tube is provided, which being raised or low- 
ered serves to vary the depth of the wick on the outside and to 
adjust the flame with great nicety. This appendage is import- 
ant also as a means of giving the exterior of the wick a smooth e 
outline and-securing an even action of the converging streams _ 
of air on the flame. The — of the lamp _— be eo 
from its pedestal and placed on a ring-support ree 
curtent of air upward through the central he 
As the effect in these experiments depends upon the a 
the flame and its position within the resonant tube to the dimndee : 
sions of the latter. With a tube two feet long the flame should 
be short afid placed so that its base may be about on a level 
with es lower edge of the tube. With one five or six feet in 
length we must use a ae flame and depress the tube an inch — 
or more Bow «18 1 When this is done = eee will be ff 
to contract 
ameter, ek from a Wighineh incl 6 six feet long. “With: oo 
arrangements an alcohol wick- flame affords a clear m usical sound 
ad 
