812 H. Carmichael—Presentation of Sonorous Vibrations 
Art. XXXVIII.—The Presentation of Sonorous Vibrations by 
means of a Revolving Lantern; by HENRY CARMICHAEL, 
Ph.D. (Gottingen). 
At the meeting of the American Association for the Ad- 
vancement of Science at Hartford in 1874, a paper was read by 
the author on “ A new method for the presentation of sound 
waves,” in which was described the arrangement represented 
The principal novelty of this consists in a small lantern con- 
taining a coal-gas flame connected with a Kénig’s manometric 
capsule, the upright lantern being so placed at the end of a 
horizontal arm that it could be rapidly revolved in the hor- 
zontal plane. 
1. 
ae 
oe ee 
- 
me 
_— 
= . 
--— 
- 
he lantern arm T is bent in to the vertical axis of revolu- 
tion, and by an enlargement at this place it is made to slip over 
and form a gas-tight joint with the right-angled tube N, which 
is firmly fastened in the base block E. The rotation of the 
lantern is conveniently maintained by a small water-wheel 
attached to the vertical shaft. The water enters the case at 5 
and escapes at B. That the lantern may ran smoothly the 
moment of the lantern O is counteracted by the adjustable 
weight P. : 
Flexible tubing connects N with Kénig’s manometric yes" 
sule. hen no sound enters the capsule a smooth bam 
of light appears, which, on the introduction of sound, 8 
broken into a series of teeth, large or small, simple or COM 
pound, according to the nature of the sound. The peculiar 
ties of this flame-band can be seen from the most distant parts 
of an audience room. 
