[Early types of switchboards, Old Spring Exchange.]

[Early types of switchboards.]

[Radio transmitting station--Western Electric Company.]

[Teletypewriter switchboard.]

[Close up of a teletypewriter switchboard.]

[Broadcasting studio at Western Electric Company, 463 West Street.]

[S. S. Normandie at the time of her arrival in New York Harbor.]

[New York Fire Department Water Tower.]

[Fire engine.]

[Broadway, north from Cortland Street.]

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

[Harding speaks at Tomb of unknown soldier.]

Marconi, Wireless Telegraphing Apparatus.

Headquarter building of the American Telephone and Telegraph Company.

[Morse telegraph recorder.]

[Woman at a telegraph machine.]

[Telegraph.]

[New York City Telephone Exchange.]

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

[Man at switchboard.]