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    Slide Rule vs HO229 and 249 Interpolation Tables
    From: Mike Burkes
    Date: 2003 Jun 1, 13:05 -0700

    Hi folks and thanks for reading. I have a subject that I have been wanting
    to post for some time and it may be old stuff for some of you but I have not
    seen a formal discussion on it. Simply it involves the use of a slide rule
    or it's nautical and aviation equivalents the Nautical Slide Rule and E6b
    computer respectively to determine the "d" correction from HO 229 and 249
    added to tabulated altitude Ht to get Hc. The setup is d value over 60 = d
    correction over declination minutes. It works great for me eliminating
    double second differences, page turning, i.e. very convenient and efficient.
    Of course an electronic calculator can directly solve for d correction but
    the whiz wheels are truly non electronic and a" flick of the thumb" is all
    it takes as a number of you are well aware! Would love to hear
    comments,criticisms,etc. Thanks! Yours Truly, Mike Burkes.
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