Spherics had these comments on Aspden's discovery:
This experiment is easy to conduct and verify. You'll also find that there is a disparity when spinning up a block of aluminium without any magnets which is even easier to try as an experiment (disparity of approx. 13-16%). You'll also find the same with nickel (disparity of approx. 8-12%). With unmagnetised iron you'll also get a smaller effect in the region of approx. 5% difference.
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