Mercury arc rectifier, found in a 102 year old elevator

Mercury arc rectifier, found in a 102 year old elevator. Used for switching AC/DC current. If not from the Old World, it was more likelier built on the basis of salvaged Old World technologies.

Mercury was arguably one of, if not the most important element of the Old World.
By means of it were engineered ancient flying machines (Vimana, etc), electrical generators, as well as supposed healing properties.

That was until the people in power began demonizing mercury as toxic and not to be used in most technologies unless necessary, hense it's decline in the past century.

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