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    Re: Brown-Nassau, both sides
    From: Francis Upchurch
    Date: 2016 Apr 18, 22:12 -0700

    Grateful thanks to Frank and Roger Connor.

    Yes indeed, this is exactly what I have been looking for.

    I decided to build a replica based on the photograph of the AX side already on the Smithsonian website.Harri Ojanen,(who produced the computer generated curves ) and I took a guess as to the likely layout of the BY side ( the dark side as I called it!), based on the descriptions in the 2 key papers by Brown and Nassau and the more recent one by Luykx.

    I attach my build description notes. As you can see, we got it very nearly right, although the Vernias look a little different. Perhaps Harri, if you are  still active with  this, you could check your  Vernias against these 2 pictures?

    Despite the Vernia issue, I seem to get accurate results with my replica. (well, +/- about 5'.  often better  if I use whole number intergers for LAT and LHA)

    Many thanks again.Good team effort!

    Best wishes


    P.S by the way, I managed to persuade a nice lady at the NMN, Greenwhich to supply photographs of the Bates astronomical slide rule,(expecting them later this week), so watch this space. I feel another replica build project coming on!




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