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    Re: recommendation for slide rule ?
    From: John Doe
    Date: 2009 May 19, 06:41 -0700

    Is it possible using a slide rule to compute say Hc
    without writing down intermediate results?
    What would the steps be?
    With azimuth and the subtraction, I suppose it
    would be necessary to resort to paper for the
    final calculation?
    On Sun, May 17, 2009 at 6:21 PM,   wrote:
    > I like the K&E 4080 because the trig scales are marked in degrees and
    > minutes so use the same units as other methods of celnav. The 4081 is
    > almost identical except the scales are marked in degrees and tenths of
    > degrees. Take your pick.
    > PS. they are things of beauty.
    > gl
    > On May 16, 10:16 am, corallina  wrote:
    >> Awhile back some pdf files were posted containing a bygrave
    >> type computer.  I believe it was the original poster did a
    >> comparison using his keuffel and esser 4080 slide rule against
    >> the bygrave and perhaps a calculator.
    >> Now I am interested in trying a slide rule.  It would seem that
    >> ebay has the most to offer and I have checked prices for
    >> the one mentioned above.   At this time I am only interested in
    >> using the slide rule for sight reduction.
    >> Being rather ignorant of slide rules I would appreciate if there are
    >> other models that the list would recommend giving me a few
    >> more options before purchase.
    >> Thank you.
    > >
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