Vintage engraving middle ‘800, electrical transformer used to produce high-voltage pulses from a low-voltage direct current patented in 1851 by Heinrich Ruhmkorff German inventor.
Ruhmkorff induction coil

Vintage engraving middle ‘800, electrical transformer used to produce high-voltage pulses from a low-voltage direct current patented in 1851 by Heinrich Ruhmkorff German inventor.
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