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Old Amp Hour Meter

3118 Views 20 Replies 7 Participants Last post by  Big John
Saw this at an antique mall today. Anyone know how it worked?

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Saw this at an antique mall today. Anyone know how it worked?
Obviously it harnesses the awesome power of rust. :laughing:

I don't know how I missed this thread, that's a neat find. I don't think I'd pay $95, but it would be cool to restore it.
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