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WW1 FULLERPHONE MK3 FIELD TELEPHONE
Captain Fuller later Colonel, invented this form of military field telephone. Because of the internal buzzer unit (chopper) it could transmit Morse via only one wire, using the ground as the other connection. There was a Mk1 and Mk2 version also used during WW1, this unit is dated 1920.
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- Taught to trainees Royal Signals 1955 National Service Instructor Catterick Camp
Former Corp., Sorbie
.......... Thomas Sorbie, Larkhall South Lanarkshire, 19th of June 2016
- All British Army field phones and telegraphs of WW1 used a single wire and a ground return. These were very easy to overhear using a Moritz set that picked up the ground return signal from as far away as 1 mile. The Fuller phone could not be detected more than 180 feet away due to the nature of its DC signal. The buzz chopper enabled the signal to be scrambled so even if overheard it could not be understood.
.......... Robert Robinson, Tenbury Wells UK, 10th of August 2010