phototelegraphy
/ˌfəʊtəʊtɪˈlɛɡrəfi/Telecommunications. Now chiefly historical
noun
The telegraphic transmission of pictures; specifically facsimile telegraphy in which variations of tone are preserved.
Origin
Late 19th century. From photo- + telegraphy. Compare slightly earlier telephotography, and also earlier phototelegram.