NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Brad Morris
Date: 2010 Feb 8, 09:12 -0500
Hi Hanno
You may be on to something.
May I suggest that you construct one and solve some navigation triangles using it.
This will help us to understand your concept and way forward.
Best Regards
Brad
From: navlist-bounce@fer3.com [mailto:navlist-bounce@fer3.com]
On Behalf Of Hanno Ix
Sent: Sunday, February 07, 2010 5:44 PM
To: NavList@fer3.com
Subject: [NavList] Re: A simpler Bygrave ?
Gentlemen:
So far I have not received any answers why a single scale Bygrave never has been implemented. I suspect it has to do with the use of such a thing, however, it is not clear
to me. However, I am no sailor.
There must be some of you so knowledgeable in CelNav who have an opinion. Please, just drop me a note.
Regards
H
PS, again: in the formulae below x=1...89;
should be replaced by x=(1:89)/180*PI
From: Hanno Ix <hannoix@sbcglobal.net>
To: NavList@fer3.com
Sent: Fri, February 5, 2010 4:43:47 PM
Subject: A simpler Bygrave ?
Ageton's method can be, mathematically at least, performed with a single scale, log cosec or log sec.
Therefore, it should be possible to create a version of the Bygrave that contains just a single scale of cosec or sec.
For convenience, one could add one or more cursors as convenient.
Note: The CelNav on Starpath's Emergency Navigation Card can be reduced to this method.
Just compare their N(x) Table with : n(x) = logn(cosec(x)) for x=1...89;
I can see certain mechanical advantages of a one-scale Bygrave. I am sure this has occurred to somebody else long ago, too.
Therefore I ask why, despite its seeming simplicity, such a version has never been implemented.
Regards
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