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A French telephone post in a cave, France, World War I, 1915. A print from Le Pays de France, 9 September 1915
Edison carbon telephone, 1879. Wood engraving
Sending and receiving apparatus with battery box at base, Edison carbon telephone, 1890. Solid metal diaphragm. Wood engraving
Wall-mounted Edison carbon telephone with pony-crown receiver, New York, 1879. Wood engraving
Edison telephone in a wall-mounted box, New York, 1890. Wood engraving
New York telephone subscriber making call through operator at telephone exchange, 1883. Apparatus in picture used an Edison transmitter and a pony-crown receiver
Edison transmitter and a pony crown receiver, New York, c1891. Telephone apparatus available to New York subscribers. This used an Edison transmitter and a pony crown receiver
Cross-section of Edisons lamp-black (carbon) button telephone transmitter (microphone), c1891. Wood engraving
United States Army Signal Corps using captured German telephone equipment, World War 1. Photograph. Signal Corps Museum, Fort Monmouth, New Jersey
Central Telephone Exchange, Paris, 1883. Central Telephone Exchange, rue de Lafayette, Paris, staffed by female telephonists. From Louis Figuier Les Nouvelles Conquetes de la Science, Paris, 1883
Telephone switchboard, 1956
Apollo director Phillips monitors Apollo 11 pre-launch activities, Florida, USA, 1969. From the Kennedy Space Flight Center control room, Apollo Program Director Lieutenant General Samuel C
