One of the mysteries of the English language finally explained.
An apparatus for transmitting and reproducing photographs or other images telegraphically, in which a photograph printed in such a way that its thickness varies with the darkness of the image is physically scanned with a stylus to produce a variable electrical signal, which can then be reproduced as an image on photographic paper using a beam of light that varies in intensity as a function of the signal.
Early 20th century; earliest use found in Scientific American Supplement. After French téléstéréographe.
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