relating to or involving any of various (hypothetical) means of transmitting and reproducing images over a distance by converting light into…

Designating any of various devices used for transmitting and reproducing images over a distance by converting light into electrical signals; spec.…

pertaining to the telautograph.

Of or relating to the telegraphic transmission of images.

Facsimile, facsimile telegraphy. Also, a facsimile copy obtained in this way. Frequently attributive.