[Telephone operators.]

[Telephone operators.]

[People observing telephone operators.]

[District selector frame in a dial exchange.]

[Sender frames, dial equipment.]

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

Communications, Telephone Exchange.

Telephone, New York Telephone Co. Exchanges.

Telephone, New York Telephone Co. Exchanges.

Communications, Telephone Exchange.

Communications, Telephone Exchange.

Communications, Telephone Exchange.

Communications, Telephone Exchange.

Telephone, New York Telephone Co. Exchanges.

Communications, Telephone Exchange.

[New York City Telephone Exchange.]

[Early types of switchboards.]

[Early types of switchboards, Old Spring Exchange.]

[Overseas switchboard at 32 Avenue of the Americas.]

P. C. Knox