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Waltenhofen Pendulum is backordered and will ship as soon as it is back in stock.
If you allow two aluminium sectors, one whole and the other cut, to oscillate with the excited magnet, you can see that the oscillation slows down more quickly in the first instance, because of the parasitic currents.
We're expanding Bunsen to allow comparison of non-science products, too! Preview the new site here (beta)
