Thordarson Autoformer Info?

[KB3DKS]

  I found a couple of these old Thordarson Autoformer All Frequency Amplifier transformers. The hookup is as an autotransformer with the terminals marked as Plate, Grid and B+?. A non powered bench test shows very good frequency response
with approximated matching.
  The recent thread on early Regens reminded me that these transformers provided free gain in whatever circuit that they were used in but none of the Thordarson catalogs list this type. Not even ones from the 30's.

 I would assume that the grid output connection was capacitor coupled but could be wrong.

  So do any of the antique radio buffs here know where these were used ? data?

Bill, KB3DKS in ! Land
   

[KB3DKS]

To reply to my own post,
As they say Google is your friend.
For anyone interested:

A 1925 Popular science article has a user comment where he applied these transformers to a Regen Receiver that he built. (right side of page small print)
http://books.google.com/books?id=4ygDAAAAMBAJ&pg=PA84&dq=Thordarson+Autoformer#v=onepage&q=Thordarson%20Autoformer&f=false

 See , It does have to do with regen radios.

Now, does anyone have a mid-late 20s Thordarson catalog that they can copy the data and circuit diagrams from. It is too difficult to read the ones pictured in the P.E. pages.

Bill KB3DKS in 1 Land