FL,
This search (sorry, not clever enough to smarten it up) brought up a few relevant hits.
Interestingly, there was an appeal a while ago on the White Waltham notice board at from someone looking for information on the Somers Kendall SK-1. IIRC, they had some bits of it.
Best wishes,
Chris
http://www.dogpile.com/dogpile/ws/re...7?_IceUrl=true