[Teletypewriter switchboard.]

[Close up of a teletypewriter switchboard.]

[Early types of switchboards.]

[Early types of switchboards, Old Spring Exchange.]

[Woman at a telegraph machine.]

[Overseas switchboard at 32 Avenue of the Americas.]

[Switchboard at the long distance headquarters of the American Telephone and Telegraph Company.]

[Morse telegraph recorder.]

[Morse Relay machine.]

[Telegraph.]

[Telegrams sent and received today.]

[Sender frames, dial equipment.]

[General view of some of the dial equipment, Trafalgar Central Office.]

[Communication engine room.]

[Morse recorder made by Samuel F. B. Morse.]

[People observing telephone operators.]

[Telephone operators.]

[War emergency radio service.]

[District selector frame in a dial exchange.]

Marconi, Wireless Telegraphing.