Slide Rule vs HO229 and 249 Interpolation Tables
Subject: Slide Rule vs HO229 and 249 Interpolation Tables
From: MIKE BURKES (m_burkes@XXX.XXX)
Date: Sun Jun 01 2003 - 16:05:40 EDT
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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