Many thanks for the further comments Brecht and Marc. The Channel Islands is also a good possibility, unfortunately there is no provenance or history with it. In any event it certainly is intriguing and could have been used in a number of scenarios. Regards, Clive.
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Had and old 'Sparks' friend of my Dad have a look at the pic and he said it is most likely a
'Tesla receiving transformer'
Add a battery to terminal and it should 'spark' if someone was transmitting to it.
Here is how to build one
http://www.teslaradio.com/pages/handheld.htm
sort of sounds likes what is in your book
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