UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Kemp & Co Kemp's Coil Machine

rontech · 2nd Aug 2020, 9:01 am

It looks like a classic induction coil, Ruhmkorf coil. I built a number of these in my mid teens. I had an old ( 1888 ) book on Electricity and Magnetism which gave details.

If you google Ruhmkorf there are some youtube videos featuring such coils.

They were made for medical use, and general amusement ( do not try this at home ).

When I was a student at Southport Tech' 1954 - 1957 there was an enormous Ruhmkorf coil in the physics lab. The coil was about 18 - 24" long and 8" diameter. They need a high current source say 12 v DC. This coil ran off a car battery and the secondary could produce big fat sparks about 8" in length.

This link provides some information: https://www.britannica.com/technology/Ruhmkorff-coil

2nd Aug 2020, 9:01 am	#4
rontech Heptode Join Date: Jun 2017 Location: Southport, Merseyside, UK. Posts: 646	Re: Kemp & Co Kemp's Coil Machine - What is it's purpose? It looks like a classic induction coil, Ruhmkorf coil. I built a number of these in my mid teens. I had an old ( 1888 ) book on Electricity and Magnetism which gave details. If you google Ruhmkorf there are some youtube videos featuring such coils. They were made for medical use, and general amusement ( do not try this at home ). When I was a student at Southport Tech' 1954 - 1957 there was an enormous Ruhmkorf coil in the physics lab. The coil was about 18 - 24" long and 8" diameter. They need a high current source say 12 v DC. This coil ran off a car battery and the secondary could produce big fat sparks about 8" in length. This link provides some information: https://www.britannica.com/technology/Ruhmkorff-coil __________________ Time flies like an arrow, fruit flies like a banana Last edited by rontech; 2nd Aug 2020 at 9:08 am.