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Mercury arc rectifier converting AC to DC.
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Previously:
https://www.homemadetools.net/forum/...107#post165002
https://www.homemadetools.net/forum/...857#post235500
https://www.homemadetools.net/forum/...250#post150146
Aw a nice little one, in the underfloor area below what was the projection room of an old cinema I was working in we found a good dozen of the big ones for the long gone carbon arc projectors, all cracked, but still full of mercury. I priced the mercury up, and it ran to tens of thousands, even dirty, but the only legal disposal route we had could only take a pound at a time per month. The rectifiers are probably still there 35 years on...