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Classic Ruhmkorff Coil

Classic Ruhmkorff Coil

7.00 LBS
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Product Description

The Classic Ruhmkorff Coil by Active Statics:

Our Classic Ruhmkorff Coil elegantly produces a 50,000-volt, 2-inch spark from only 12 volts DC. We specially designed our interpretation to maintain the historically accurate appearance, and color scheme of the 1800's. We go as far as to antique the wood finish as well as use mechanisms and methods Ruhmkorff himself would have been very familiar with. 

We designed our interpretation of Heinrich Ruhmkorff's coil as a high voltage power supply for operating Crookes Tubes and Geissler Tubes, as these machines were used when manufactured on a large scale. Aside from powering vacuum tubes, this coil proves to be an impressive demonstration in it's own right, perfectly suited for explaining Faraday's Law of Induction to even the hardest to impress students. 

During our design process, we took the liberty to improve upon coils that were available over 165 years ago by incorporating some modern materials.  Acrylic plastic supports the coil and spark gap for the best insulation. Modern high temperature insulation surrounds bus wires to ensure proper isolation. In addition, we employ tungsten alloy contact points in our interrupter mechanisms and modern commercially proven capacitors to ensure dependable operation. 

Classic Induction Coil Features:

  • 50kV, 5mA output - Produces 2 inch sparks. 
  • Adjustable spark gap
  • Historic design and styling.
  • Output reversing switch, made to use during coil operation. 
  • Period accurate binding posts for input, accept stripped wire, alligator clips, spade terminals or ring terminals. 

Operating The Classic Induction Coil:

  • Requires hook-up leads and a 6-12 volt, 5-amp power supply (12 volt batteries are ideal).
  • Switch power "off" even when coil is not connected to power supply.
  • Adjust screw contact to lightly touch trembler mechanism. 
  • Placing a small amount of synthetic, dielectric grease across both contacts of trembler mechanism will help with cooling and performance. 
  • Connect to power supply, and turn the switch "on". If slight contact is not made, coil will not start automatically. 
  • This is a high voltage device and should be treated carefully. Never touch actual coil, trembler or spark gap while in operation.  

Product Videos

Classic Ruhmkorff Coil by Active Statics (00:19)
This little high voltage step-up transformer is our interpretation of the Ruhmkorff induction coil. We named this beauty our "Classic Ruhmkorff Coil" because we styled everything after Heinrich Ruhmkorff's models. We did take some liberty in using modern materials such as wire with superior insulation and commercially available capacitors. Never the less, our coil will produce sounds and sparks very familiar to most physicists of the late 1800's. We designed this unit to be the perfect power supply for Crookes Tubes, Geissler Tubes, various high voltage demonstrations and own it's own, a tangible way to show the effects of electromagnetic induction.
  • Classic Ruhmkorff Coil by Active Statics
    This little high voltage step-up transformer is our interpreta...

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