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What's the last one? (Bottom right)
A mercury arc rectifier. The mercury vapor is ionized, and used for increasing the current carrying capacity of the component – compared to how much a traditional valve design with complete vacuum would work.
In short, it makes DC out of AC.
Courtesy of google lens
https://www.postalmuseum.org/blog/powering-mail-rail/
In short a rectifier for post office railway?!
Edit: contents and Spelling
110 comments