[Boatanchors] Cardwell variable capacitor

[HL]

A 17-pound Cardwell variable capacitor followed me home from the local
DeAnza Ham Swap Meet. Does anyone have a Cardwell catalog from the
1930s or 1940s that lists this beautiful monster? Or, does anyone know what 
transmitter might have used it?  It is identified as “Type S, Model GF-35-JS.”
The thick solid bronze (or brass) plates are quite rounded and 
spacing is .75 inches, so, I would guess it can handle 30kV!

Hmmm--now I need to find a matching tube!

Photo at  http://userwww.sfsu.edu/~hl/Cardwell.VarCap.TypeS.jpg

73 Hal KK6HY