"I've got this beautiful panoramic three-dimensional painting of Mars based on Martian photos. It's 30 feet wide. You can pick out every pebble on the Martian landscape. And who'd have dreamed you could do that?"
As far as I know, Gernsback was the first person to formally describe a device using bone conduction to transmit sound; he received a patent in 1924.
Here are the figures that accompanied Gernsback's 1923 patent filing for the Acoustic Apparatus:
See the original patent filing (pdf).
Acoustic Apparatus (Osophone)-related
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