High voltage induction coil of 1850s, way before Tesla's showmanship (so much misinformation)

Induction coil by Heinrich Ruhmkorff, 1850s. In addition to the hammer interrupter (right), it had a mercury interrupter by Fizeau (left) that could be adjusted to change the dwell time.

Scan made by Kogo - Scanned from Bibliothek allgemeinen und praktischen Wissens für Militäranwärter Band III (Library of General and Practical Knowledge for Military Candidates, Volume III), 1905, Deutsches Verlaghaus Bong & Co, Berlin * Leipzig * Wien * Stuttgart

Heinrich Daniel Ruhmkorff's induction coil. The mechanisms at the ends are interrupters, vibrating switches that interrupt the DC current flowing in the primary winding of the coil to create the flux changes necessary to induce high voltage in the secondary winding. This coil has two interrupters; the one at the right end is a common "hammer" interrupter with metal contacts. The one on the left is a type invented by Fizeau that uses a metal needle dipping into mercury, covered by a layer of alcohol to suppress the formation of sparks, resulting in higher voltages.
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en.wikipedia.org/wiki/Induction_coil#/media/File:Ruhmkorf...

Taken on: September 1, 2018

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Induction

coil

induction coil

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