[Woman at a telegraph machine.]

[Morse telegraph recorder.]

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

[Teletypewriter switchboard.]

[Telegraph.]

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

[Sender frames, dial equipment.]

[Telegrams sent and received today.]

[Communication engine room.]

[Man at switchboard.]

[People observing telephone operators.]

[Close up of a teletypewriter switchboard.]

[Telephone operators.]

[War emergency radio service.]

Marconi, Wireless Telegraphing.

[District selector frame in a dial exchange.]

[Telephone operators.]

[Telephone operators.]

[General view of sender frames in a panel dial central office.]

[H.L. Horton & Co. Interior, stockboard.]