Transmission of a telephone call from San Francisco to Plymouth, England.

A film shows how voice travels over phones, and dramatizes the transmission of a telephone call from San Francisco to Plymouth, England. Functions of generators, towers, transformers, technicians at circuits, wire lines and the aerial systems at Rocky Point in New York, Cupar in Scotland and Houlton in Maine. Shows switchboard activity at the London Trunk Exchange. Workers, mostly women answering calls in telephone exchange.