2s 
62 Influence of Musical Sounds on a Jet of Coal-gas. 
The photographs of the apparatus and operations which I sub- 
mit to the Association, were taken by Mr. Black, of the firm of 
Whipple and Black, Boston, who exerted himself especially in 
the matter and succeeded, under many disadvantages, from va- 
riable weather and the roughness of field arrangements for pho- 
tography, in making satisfactory representations, | 
he views of the apparatus and operations (see Plate) in- 
clude the placing of the apparatus over a mark, the aligning, 
the setting of the trestles in advance of the measurement, t 
shows the topographical features of the ground, and another 
gives the profile of the base as graded for measurement. 
Art. IX.—On the Influence of Musical Sounds on the Flame ofa 
Jet of Coal-gas ; by JoHN LeConte, M.D., Professor of Natu: — 
ral Philosophy in the South Carolina College. 
oe sHort time after reading Prof. John Tyndall’s excellent at 
ticle ‘‘On the Sounds produced by the Combustion of Gases in 
entertainment. Three instruments were employed in the : 
tM 
ee from the brick wall near the piano. Both of them | 
urnt with remarkable steadiness, the windows being closed and 
man might have seen the harmony. As the evening advanced, an¢ 
the diminished consumption of gas in the city increased the pre’ — 
sure, the phenomenon became more conspicuous. The jumping — 
of the flame gradually increased—became somewhat irregulat— — 
and finally it began to flare continuously, emitting the character” — 
istic sound indicating the escape of a greater amount of gas tha? = 
* Vide Philosophical Magazine, 4th Series, vol. xiii, p. 473, 1857. 
