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Updated: June 22, 2025
Bless the pair of them, they might have been a month there, and no better off for, you must know that I had taken out the armature, and if you take out an armature and don't slip a bit of soft iron in after it, your magnets are done for, and will never be worth anything again until they are re-magnetised.
A powerful ordinary horseshoe magnet might probably do just as well, but would require to be re-magnetised from time to time. To silver copper plates, that is, to amalgamate them on the face with mercury, is really a most simple operation, though many batterymen make a great mystery of it.
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