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    Re: Bygrave formula accuracy on 10 inch slide rule
    From: Hewitt Schlereth
    Date: 2015 Jul 8, 10:07 -0700
    Greg, offshore with a 4070-3, spherical trig, and reading glasses? Urp! Have you a supply of promethazine aboard? :-)

    Hewitt





    On Jul 8, 2015, at 9:26 AM, Greg Rudzinski <NoReply_Rudzinski@fer3.com> wrote:

    Francis,

    I'll be doing an on the water test with the K&E 4070-3  10" today to see how hard it is to accurately manipulate the slide rule in a rocking sailboat using reading glasses. I'll post the results good or bad in a few days with a step by step for you.

    Greg Rudzinski

    From: Francis Upchurch
    Date: 2015 Jul 7, 23:54 -0700

     

    Greg,

     

    I’m really interested in trying the Bygrave formulae with my old school boy (1960s)Thornton 10”. I haven’t used it for years. Have failed miserably! If you have time, please send me a step by step example, including the slide rule moves. I would like to compare results against Otis King/trig tables, Bygrave and mini-Fuller.

     

    What sort of accuracy are you getting with the 10”?

     

    Best wishes

     

    Francis

     

       
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