Yes, right, I've used those also. It wasn't clear which you meant though.
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4 years ago
mag base remagnetizing
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4 years ago
I didn't specify the magnet or how to build the coil because I don't have that sort of experience, beyond being an operator.
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solid cabinet holds the huge electromagnet and the desktop is a pen plotter for the output.
"This is also the basis of magnetic resonance imaging (MRI.). It should be called "NMRI" but some people don't like that word "nuclear."
"Signal averaging often meant scanning overnight."
Actually the output was quite clean after I spent half an hour fine-tuning the machine. The 14,092 Gauss magnetic field needed to be uniform across the sample to within something like 1 part in a billion. Earth's magnetic field is about 1/2 Gauss.
As the only undergrad with an NSF summer research grant I was assigned the after-midnight shift. After a few nights I got used to walking the streets of a dark, deserted world.