Phonodeik

The Phonodeik is a sound recording apparatus invented by Dayton Miller in 1908. The Phonodeik converts sound waves into visual images. The name was suggested by Edward W. Morley. Before electronic oscilloscopes, this device was used for analyzing sounds waves. The Phonodeik can be modified to project sound waves on a screen for public demonstration.

Description

The Phonodeik used photographic material to record sound. A diaphragm receiver of thin glass is at the end of a resonator horn. Behind the diaphragm is a steel pulley spindle mounted in jeweled bearings with an attached mirror and oscillating tension spring. Wrapped on the pulley spindle are thin silk fibers or platinum wire turning around the mirror with amplitude. The sound vibrates the diaphragm on the bottom and a light beam is reflected to the sensitive photographic paper (or a projection screen).

gollark: Sure. Although it's still hard to distinguish whether that's a "science" thing or a "weird societal factors" thing.
gollark: I think those just became uncool due to other factors of some kind; there are plenty of Christians etc.
gollark: Actually, "abounded" would probably mean "unbounded", "a" generally negates things.
gollark: America's central government is also much more powerful than the EU and it has more shared cultural institutions maybe.
gollark: IIRC the total population is less than Europe too.

See also
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