Mercury arc rectifier, switching AC/DC current at a 102 year old elevator. —Reminds me of that old .pdf that got scrubbed off Google and DuckDuckGo about all the uses of Mercury (medical, hair, lotions, old fire places, cars, etc).

Mercury arc rectifier, switching AC/DC current at a 102 year old elevator. —Reminds me of that old .pdf that got scrubbed off Google and DuckDuckGo about all the uses of Mercury (medical, hair, lotions, old fire places, cars, etc).