Improvement in the Diaphragms of Phonographs, Musical Instruments, and analogous Sound-producing, Recording or Transmitting Contrivances.

摘要

3393. Stroh, J. M. A. Feb. 16. Violins and like instruments ; mandolins; guitars. -Relates to diaphragms for musical instruments such as described in Specification No. 9418, A.D. 1899. The diaphragm is flat or corrugated in its outer portions and has a central conical portion, as shown, to the apex of which the vibrating attachment is made.