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    Re: Longhand Sight Reduction
    From: Hanno Ix
    Date: 2014 Jul 26, 18:32 -0700
    Hi, Greg, Norm, Peter

    remember we recently discussed multiplication of 4-digit numbers? The context was Doniol and speed. My favorite is still Vedic but another method occurred to me: The Flat Otis. ( How original is this ? :)  )

    Peter Monta published a nice Otis scale years ago at www.pmonta.com/sliderules ( copy attached). His scale leads easily to a Flat implementation. The Otis seems specifically designed for 4-digit multiplication / division according to this scale. I, however, have never used one to make a judgment at this time.

    I plan to try out the Flat Otis in the near future. Until then I hope to get some comments from you about this idea. Presently I am still tinkering with R. Stuart's scales for an optimized Flat Bygrave - optimized for my personal use, that is.

    And Norm: I think the Flat Otis will be a wonderful way of paying homage to Napier.

    Thanks, Peter!

    Hanno








    On Sat, Jul 26, 2014 at 10:26 AM, Greg Rudzinski <NoReply_Rudzinski@fer3.com> wrote:

    For those in need of compact haversine tables see the attached pages from a Wiley's 1948 printing of trig tables.

    These tables require interpolation. Mental  interpolation shouldn't be a problem here. Listing every 10' saves lots of space. 

     

    Greg Rudzinski



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