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Thomas Goulding Mc Ilvride
Edmund Ridings
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Publication of GB190118399ApublicationCriticalpatent/GB190118399A/en
18,399. McIlvride, T. G., and Ridings, E. Sept.14. Phonographs, graphophones, &c. are provided with sound trumpets formed with conical sections a. When the trumpets are to be varied in length, different sizes of bell mouths b may be employed, the larger sections and bell mouths being discarded as desired.
GB190118399D1901-09-141901-09-14Improvements in Phonographs, Graphophones and the like Sound Recording Instruments.
ExpiredGB190118399A
(en)
Improvements in methods of, and apparatus for, increasing the volume of sounds from telephonic or phonographic instruments, and transmitting such sounds to distances