This example of a World War 2 field
telephone is almost an ancestor of a mobile phone. It was probably
used in a North African desert, say in Libya, in the early 40s.
I got it at the street auction in Ringwood a few years ago for
£2. The phone is similar to the more common basic Tel F
equipment shown below, but in addition uses a set of valves and
more powerful batteries to drive its amplifier which develops
greater power and sensitivity to operate over very long wires.
For its size it's extremely heavy and not as portable as its