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    Fwd: Slide Rule vs HO229 and 249 Interpolation Tables
    From: Mike Burkes
    Date: 2003 Jun 1, 16:11 -0700

    >From: MIKE BURKES 
    >Reply-To: Navigation Mailing List 
    >To: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    >Subject: Slide Rule vs HO229 and 249 Interpolation Tables
    >Date: Sun, 1 Jun 2003 13:05:40 -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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