what is this device and what can i do with it and how much can i sell it for

hello everyone i have a question for the collective minds of the instructables community i recently went to a garage sale and purchased the device you see below my questions are what is it and how much can i sell it for

thank you,
fidgety 2

Picture of what is this device and what can i do with it and how much can i sell it for
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gmoon5 years ago
Variacs are still highly valued by anyone who tests vintage or builds new vacuum tube equipment--amplifiers, radios, etc., or any vintage electronics.
Goodhart gmoon5 years ago
Yeah, I have been looking for one (within my budget) for YEARS now LOL
Kiteman5 years ago
Don't sell it, build a welder.
fidgety2 (author)  Kiteman5 years ago
I already have built a MOT spot welder how could this be used in a welder though you have me interested please explain
fidgety2 (author)  fidgety25 years ago
P.s. I am taking welding courses at a local technical college and hope to major in welding so this information would be of great help to me
I thought they were used as power controllers in DIY welders?

See:

https://www.instructables.com/id/Build-a-Microwave-Transformer-Homemade-Welder/

Oh, Teslas can use them as well:

https://www.instructables.com/id/Build-a-Musical-Tesla-Coil-like-a-Pro/
NO ! And its a very important distinction. These are variacs (autotransformers). Welding controllers are variable taps on ISOLATING transformers
Noted.
....and also, tapped for low voltages for welding, the high current will destroy the windings.....
fidgety2 (author)  Kiteman5 years ago
Cool I now have a weekend project thank you
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