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Interesting piece of militaria, possibly WW2 era
Unit used for testing detonator charges when using thin wire as a means of ignition, the wire would be fixed between two pillars and the current increased until the wire burned out, it then had to be calculated what charge would be needed to rupture the wire when surrounded by an explosive substance and ignite it successfully.
Condition and contents as per photos.
In wooden casing with brass plaques