The Fullerphone is an innovative telegraph system that operates with a direct current on the line, allowing simultaneous telephone and telegraphic communication. It includes a Morse key and a headset, as well as a voice transmitter/receiver. Its operation with low currents enabled longer communication lines without signal loss, and it had the advantages of simple construction and easy installation.
This wired telegraph system (TPF – Telegraphy by Wire) was developed by the British Artillery Captain Algernon Fuller during World War I and remained in use until World War II (1939-1945), despite wireless telegraphy (TSF) already being widely developed.
It was used by the Portuguese Expeditionary Corps (CEP) during World War I (1914-1918), and continued to be used in Portugal until the 1940s. It was manufactured in Lisbon by the General Engineering Workshops. This example, part of the Military Collection of the Museum of Angra do Heroísmo, is a small-sized model (Mod. 16) produced at the General Engineering Workshops in Belém, Lisbon, from 1935.
