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A violet ray is an antique electrotherapy medical device invented by Nikola Tesla that’s essentially a portable tesla coil. Altdorf, Germany-based photographer Marc Simon Frei purchased a unit from 1920 on eBay and customized it for experiments with photographing electricity at home.
Frei generated electrical discharges in various ways and forms, and then captured them using a Nikon Df, a macro extension tube, and a Nikon 50mm f/1.8 lens.
“Don’t try this at home,” Frei says, “the high frequency voltage could damage your equipment.” Bringing his camera close to the apparatus also caused his LCD screen to flicker.
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Frei has also experimented with creating miniature lightning at home using some stuffing taken from the guts of a teddy bear as clouds. “I wanted to create a private thunderstorm at home,” he tells us.
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You can find more images from Frei’s experiments and follow along with the series in this online photo album.
(via Marc Simon Frei via Colossal)