Two Old Variacs

[MoltenVoltage]

The numbering scheme is as follows:

Staco 2 = Ground

Staco 3 = Hot Output

Staco 4 = bottom right terminal - not connected

Staco 5 = Hot Input

Staco 1 = unconnected tap

It sure looks like a single winding.  Are you saying there are two windings interlineated with each other on my Variacs?

If not, I am having a hard time understanding how a single winding transformer can step up.

Thanks again!

For anyone interested, here are the pages we are discussing:
http://www.moltenvoltage.com/Two_Old_Variacs.html
http://stephenhobley.com/blog/wp-content/uploads/2009/03/variac1.jpg

[PRR]

http://en.wikipedia.org/wiki/Autotransformer