NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Fwd: Slide Rule vs HO229 and 249 Interpolation Tables
From: Mike Burkes
Date: 2003 Jun 1, 16:11 -0700
From: Mike Burkes
Date: 2003 Jun 1, 16:11 -0700
>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. > >_________________________________________________________________ >Add photos to your e-mail with MSN 8. Get 2 months FREE*. >http://join.msn.com/?page=features/featuredemail _________________________________________________________________ MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. http://join.msn.com/?page=features/virus