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EUREKA 6 INCH RUHMKORFF INDUCTION COIL, 1930's
Electromagnetic induction was discovered by Michael Faraday (1791-1867).
In 1831 Nicolas Callan (1799-1864) invented the Induction coil.
In 1836 they were used for medical complaints such as skin disorders, and to power X ray machines.
Marconi used one for his experiments prior to developing his system at Poldhu in Cornwall for the first transatlantic transmission. Coils like this were used in spark transmitter systems for the next 30 years.
Later coils such as this unit, were made for schools and Colleges as demonstration units.
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- This Ruhmkorff coil is not of the type used for transmitting Marconi's first transatlantic signal in 1901. His transmitter was a large 25 kilowatt alternator feeding into a system of coils, transformers and capacitors - designed by Professor John Ambrose Fleming.
.......... Dr Anthony Constable, Ealing, London, 3rd of November 2010