Have you seen this ad (supposedly from 1926)?
5413054756_9accf30d15_o.jpg
If you're lens is the same as the mentioned 19 inch version it should cover 11x14 inch.

And maybe this article has some useful info for you?
http://randcollins.wordpress.com/200...astigmat-lens/

And I suppose you know the this LF forum: http://www.largeformatphotography.info/forum/index.php
Probably a lot more people there with real info for you.