I'm guessing you have something like
http://cgi.ebay.co.uk/ws/eBayISAPI.d...9&category=361 which is quite a rare collectors piece.
Try the following...
http://www.mat.bham.ac.uk/C.J.Sangwi...liderules.html
http://www.sliderule.ca/
I have to confess, I have a small private collection of interesting slide rules, but an Otis King cylindrical has very sadly somehow escaped me. Amongst aviation slide rules I own are...
USAF type CPU-73A/P "Attack computer"
RAF Lifeboat site computer Mk.1
A small 6" log-log rule stamped "Dowty aircraft components, Cheltenham"
A 6" specialist slide rule for calculating air flow rates, stamped "Lucas Gas Turbine Equipment"
A Scout Helicopter "Flight Envelope computer".
There, my secret's out, I am a very sad individual with very odd hobbies.
G