Viron writes – “This instructable will progressively show how to make at least one kind of telephone that sounds good enough to be fun and useful, without requiring batteries, AC utility company power, or utility telephone services. I suppose it may be most appreciated by smart young children with “forts”.” – Link.
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Also known as a voice-powered phone. This priciple was used by the Navy. A regular maintenance task for Naval technicians was to pick the paint out of the earpiece and mouthpiece holes of a handset after it was painted over by a bosun!