AMERICAN 
JOURNAL OF SCIENCE AND ARTS. 
[THIRD SERIES] 
Apr. IX.— Researches in Leadien by ALFRED M. MAYER. 
Paper No. 5,* containing : 
i, An Experime mtal Confirmation of Fourier’s Theorem as applied to the decom- 
ea a the ie plage of a composite sonorous wave into its elementary pen- 
um-vi 
2, An Expe seisia ital Illustration of Helmholtz’s Hypothesis of Audition. 
3. Experiments on the su ag soa Seri!  / mpae of ee ero Mosquito. 
+. Suggestions as to the of the ks al scalz of the Cochlea, leading to 
an 
5. Seven Experimental Methods of Sonorous Aoakjais described and discussed. 
6. The Curve of a Musical Note, formed by combining the sinusoids of its first six 
harmoni rmed -by combining the curves corresponding to 
nics; and the curves fo 
various consonant i etpoy 
7. Experimen’ ee she See ek Sarees ok eee 
elementary vibrations forming a mu: pale note; or is set in motion by gm com- 
bined action of sonorous vibrations forming various consonant intervals. 
An Experimental Confirmation of Fourier’s Theorem as applied 
ee the decomposition of the vibrations As a | oo sonorous 
wave into its elementary pendulum-vibra 
A simple sound is a sound which has oe one pitch. Such 
@sound js produced when, with a bow, we gently vibrate the 
prongs of a tuning-fork and bring them near a cavity which re- 
sounds to the fork’s fundamental tone. An almost pure simple 
sound can be obtained by softly blowing a closed organ-pipe. 
On examining the nature of the geal motions of the 
* This paper is the fifth, in the series of those on Acoustics, already published 
in this Journal. The p' papers, however, ie not numbered. 
ions |, 2, 8, 5, Gand 1 of this paper we re read before cap haneoncrs Acad- 
emy of Sciences during the session of Somasben: 1873. Section 4 
- the Academy on April 21, 1874. 
Am. Jour. Sc1.—Turp HIRD Serres, Vou. VIII, No. 44—Aue., 1874, 
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