Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 723
sshown in Fig. 319/, which represents the apparatus in section. The trac-ing point (/) is not attached directly to the vibrating diaphragm, but to anadjustable spring (s), and interposed between the spring and the thinmetallic diaphragm is a little pad, formed of a ring of small india-rubbertubing.… … Fig. 319/.—Diagrammatic Section of Phonograph. depths, and with varying frequency, as the handle is turned, bringingthe whole length of the groove in succession to be operated upon. Whenthe instrument is required to reproduce the speech so easily recorded, allthat is necessary is to allow the…
Inventions
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