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    Re: Borrowed Bygrave
    From: Francis Upchurch
    Date: 2016 Jan 15, 04:14 -0800

    Hi David, just lost the first attempt to email you!

    Not sure if you saw my various postings 2009-2013?

    I was lucky to find an original 1920s 11A on ebay for about £200 back then (worth a lot more now!) Perfect working order. Just needed replacement of felt friction pads).

    Far too precious for the wet bouncing boat, so I built a couple of copies, the first based on Gary's, the second a near perfect , authentic looking replica using scales by Wayne Harrison. Both work perfectly and give 1-2' accuracy. 

    The precious original occassionally comes out to play in the dry warm cabin of my home study. It's finest hour was a re-enactment of the famous (infamous?) Chichester Tasman sea flight , using the original nav data from his book. Gary did it first and I copied him (thanks again Gary!) . Remarkably, we both got identical results to Chichester! 

    I now use the Bygrave replica for all my routine LOPs (now also the BN which is faster, easier and nearly as accurate!) . I use the Fuller 2 for lunars etc if they require 4-7 figure accuracy. My latest Mini Fuller 2 is based on the Otis King format and has cosines in red added to the sine scale).

    I recommend cylindrical slide rules as easy to build with limited craft type skills and very accurate. I am now looking at the wonderful Margetts tables for lunars. Joy!

    Best wishes






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