9 Mysterious Mercury Arc Rectifiers

They've been a mainstay of Sci-Fi props for years but you'll be hard pressed to find someone on the street that can tell you what they actually do. They're Mercury Arc Rectifiers and our friends at Oobject have collected nine of the best.

If you're looking for more accouterments for your evil laboratory, might I suggest these Frankestein's Lab Items, this homage to the light bulb, or therse crazy Tesla Coils?

9 Mysterious Mercury Arc Rectifiers

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A three phase, six anode mercury arc rectifier, formerly used at a 600V DC traction substation of the Athens-Piraeus railway

9 Mysterious Mercury Arc Rectifiers

Household Mercury Arc Rectifier

9 Mysterious Mercury Arc Rectifiers

Mercury rectifier on display in Beromunster, Switzerland

9 Mysterious Mercury Arc Rectifiers

Mercury Vapour Arc Rectifier from University of Aberdeen Collection

9 Mysterious Mercury Arc Rectifiers

Rectifier at the Cengelhan Koc Museum in Turkey

9 Mysterious Mercury Arc Rectifiers

Rectifier from Type 80 Early Warning Radar System

9 Mysterious Mercury Arc Rectifiers

The two mercury arc rectifiers at Kempton Steam Museum, London

9 Mysterious Mercury Arc Rectifiers

Twin Mercury Arc Rectifiers from the Doncaster Odeon movie theatre

9 Mysterious Mercury Arc Rectifiers

Working Mercury Arc Rectifier