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    Re: A simpler Bygrave ?
    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


    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 ?




    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.






    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.



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