Re: Early rectifiers.
On a visit to Appleby Frodingham steel works Scunthorpe many years ago, the guide showed us the mechanical synchronous rectifier which was used to clean the air intake to the huge compressors, by the coking plant. Below the drum was a railway wagon in which the debris fell when the power was switched off and large hammer/gong hit the side of the drum. I think it was operating at 25KV.
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