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Old 5th Aug 2022, 2:41 pm   #15
Join Date: Jul 2010
Location: Wellington, New Zealand.
Posts: 639
Default Re: Old coil switch thing. Identified as a Ruhmkorff induction coil.

One thought/note of caution. In my 1890's 'Boys Modern playmate' book which has instructions on how to build one of these coils (and how to make the Potassium Bichromate cells to run them), the suggestion is to use the hollow rectangular base to hold 40 sheets of tin foil (inerleaved at alternate ends), interspersed with oiled paper 'to form a simple capacitor which will 'greatly improve the performance'. How good such an item would be after 100+ years is a moot point BUT you might just get a hefty belt off it if you've run the coil.
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