Phonozoic Text Archive, Document 143
The Carbonel Phonograph
printed record of American Graphophone Company vs. United States
Phonograph Company. Engineering, Vol. 27, p.
April 18, 1879.
The Phonograph.--the Abbé Carbonel, of the Belsunce School, Marseilles, has been experimenting with the phonograph, and concludes that the recording and rehearsing diaphragms should be distinct, the former having a very sonorous plate operating on very stiff, hard foil, the latter a delicate membrane like that of the ear. The foil could be made from a copper band thinly coated with wax to take the impression, and corroded afterwards by acid so as to obtain a hard metal cast; but this is necessarily a defective process. The Abbé, therefore, employs albumen spread upon paper or other base, instead of the wax applied to the copper. The soft albumen record is afterward hardened in a well-known manner, and a hard matrix, whose dints vary in depth with the intensity of the sound, is obtained. As a means of reproducing the sounds he suggests the use of Savart's wheel instead of a vibrating plate.