Hi, I've been using the used book search engines for the last year, searching for an old journal article. Afraid that I may never find the article, I decided to ask for help. I'm hoping that one of you living in the U.K. might have access to a library that has a good collection of back issues of "Memoirs and Proceedings of the Manchester Literary and Philosophical Society". The article is "The Construction of a Model Differential Analyser" by D.R. Hartree and A. Porter in the July 1935 issue. If you think you can help me obtain a copy, contact me and let's work out a trade. FOR THE TRULY AMBITIOUS COLLECTORS: I just thought I would mention this since some people on this list are interested in missle guidance computers. While searching for information on the 1911 Bristol Boxkite, I came across the web page for the Bristol Aero Collection, Cirencester, England. On their "Items available for disposal" page: http://www.chew46.freeserve.co.uk/aeroswap.html they list: "GAF Ikara anti-submarine missile: A number of complete missiles is available, without launcher." The page also states "The Bristol Aero Collection conforms to the rules of the UK Museum's Council and can dispose of historic items only to "Good Homes" such as Museums operating under comparable rules." In a separate search, I found this description of a Ikara: Australian ship-launched anti-submarine missile with a 12.5 nm range that employs a two-stage solid fuel motor and navigates via command guidance and an autopilot. The Aerospace Technologies of Australia, Pty., Ltd.-built Ikara is 11 ft long with a wingspan of 5 ft and weighs 980 lbs at takeoff. Happy Hunting, --Doug ==================================================== Doug Coward dcoward(a)pressstart.com (work) Sr. Software Eng. mranalog(a)home.com (home) Press Start Inc. http://www.pressstart.com Sunnyvale,CA Curator Analog Computer Museum and History Center http://www.best.com/~dcoward/analog ====================================================