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>From: MIKE BURKES 
>Reply-To: Navigation Mailing List 
>To: NAVIGATION-L@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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