[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.]
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