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1842 Mechanics' Mag. 11 June 470/1 In the infancy of electro-telegraphic communication, every one has been subscribing to the absolute necessity of protecting the wires from contact with moisture.

1854 Proc. Amer. Philos. Soc. 1848–53 5 206 During the winter I devised a new mode of working the electro-telegraphic registering upon the cylinder.

1896 Geogr. Jrnl. 8 57 The operations consisted, as usual, of triangulation, topography,..electro-telegraphic determinations of longitude, [etc.].

1976 H. L. Beaver Sci. Fiction of E. A. Poe Introd. p. viii ‘The Thousand-and-Second Tale of Scheherazade’ was gaily to expound these marvels—with those of the electrotype, daguerreotype, and electrotelegraphic printer.