314 H. Carmichael— Presentation of Sonorous Vibrations, ete. 
The lantern is revolved by a multiplying wheel, or by a 
powerful clock-work, when a uniform motion is required. Fig. 
4 shows the general arrangements of parts. 
When the oxygen is diluted with two measures of air it is 
more easily regulated as a supporter of combustion. The bril- 
liancy of the flame is considerably increased by conducting the 
coal gas through a sponge saturated with “ gasoline.” 
By regulating the flow of gases and giving the flamea rapid 
rotation, a continuous brilliant ring is produced, which is 
broken up into saw-like teeth, characteristic of the pitch, in- 
eg 4 
ee ee 
~ 
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- 
oo 
- 
J 
f pa 
tensity and quality of the entering sounds. A shrill whistle 
produces teeth so fine that they are barely visible at a distance 
of thirty feet. A loud low sound of the human voice affords 
teeth of the height of the lantern, three or more inches long; 
with one or two harmonic teeth surmounting the fundamentals. 
A rough roar yields large jagged teeth, exceedingly compli- 
cated and curious. 
On turning down the flame the teeth are reduced to brilliant 
dots, with smaller dots between them if the harmonics be 
pee It is curious to observe that no trace of flame cap 
seen between these dots, which may be three inches or more 
apart. It is not to be presumed, however, that the flame 18 6* 
tinguished, as it is possible to arrange the flow of gases so that 
the flame is invisible during a complete rotation, and yet be 
restored by simply altering the proportion of the inflammable 
gases. 
For investigating the motions of sonorous bodies an attach- 
ment is substituted for the manometric capsule, which may 
