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An Optophone.

An Optophone, a device used by the blind, that scans texts and generates time-varying chords of tones to identify letters. Dated 20th Century.
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Title:
An Optophone.
Caption:
An Optophone, a device used by the blind, that scans texts and generates time-varying chords of tones to identify letters. Dated 20th Century.
Credit:
Album / Universal Images Group / Universal History Archive
Releases:
? Model Release: No - ? Property Release: No
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Image size:
6509 x 3222 px | 60.0 MB
Print size:
55.1 x 27.3 cm | 21.7 x 10.7 in (300 dpi)
Keywords: