[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 Relay machine.]
[Telegraph.]
[Communication engine room.]
[Morse recorder made by Samuel F. B. Morse.]
[Morse telegraph recorder.]
[Sender frames, dial equipment.]
[General view of some of the dial equipment, Trafalgar Central Office.]
[People observing telephone operators.]
[Telegrams sent and received today.]
[Telephone operators.]
Marconi, Wireless Telegraphing.