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Thread: Dropping a magnet through a hollow copper bar - GIF

  1. #11
    Supporting Member Ralphxyz's Avatar
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    Ralphxyz's Tools
    There is something about that green film and the electric field that is generated that produce the moving image.
    I remember those ads.

  2. #12
    Supporting Member DIYSwede's Avatar
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    DIYSwede's Tools
    Quote Originally Posted by Ralphxyz View Post
    But why am I seeing the magnet? That's what I could not remember.
    Such as: https://www.amazon.com/Magnetic-View.../dp/B00129CCGS

  3. #13
    Supporting Member Ralphxyz's Avatar
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    Ralphxyz's Tools
    Thanks DIYSwede, magnetic viewing screen, now if I could only think of something useful.

    Now this one claims "Test Cracks on Steel Surfaces" now what/how?
    That might be useful.

  4. #14
    Supporting Member Toolmaker51's Avatar
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    Toolmaker51's Tools
    Marv is correct. Copper tube being so easy to get is seen probably 99% of the time, and what we used demonstrating to STEM classes. Though bar would make the field appear broader, more visible.
    Glad I wasn't called to make it. I machine copper now and then, making spotweld electrodes and fixture plates. Politely, many grades are quite a bear to machine.
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

  5. #15
    Supporting Member tonyfoale's Avatar
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    tonyfoale's Tools
    Quote Originally Posted by Mikell17 View Post
    I wonder why they haven’t figured out or even tried to find a way to use these in at least trucks or airplanes. Maybe they have and they’re too abrupt or something.
    Eddy current brakes are common on trucks and buses, even large vans.

  6. #16
    Supporting Member mklotz's Avatar
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    mklotz's Tools
    Quote Originally Posted by tonyfoale View Post
    Eddy current brakes are common on trucks and buses, even large vans.
    I remember a sensitive analytic balance in college that had a tiny electrical eddy current brake that could be switched on to damp the oscillations prior to taking a reading.
    ---
    Regards, Marv


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  7. #17
    Supporting Member Ralphxyz's Avatar
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    Ralphxyz's Tools
    So are these eddy currents that are being viewed?


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