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Physics, Astronomy & Cosmology / Re: What is the best core material for a reciprocating electromagnet?
« on: 08/07/2014 08:24:17 »
Best and easiest description is it's a tattoo machine, it uses an ac to dc power converter with a clipcord, the armature bar pushes a needle bar down through a tube to insert pigment under the first few layers of the epidermis