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    Re: recommendation for slide rule ?
    From: Lu Abel
    Date: 2009 May 21, 15:23 -0700

    Given that the K&E 4080 is an ordinary 10" slide rule, I'm afraid you'll be disappointed.   These standard engineer's slide rules were good for two digits of accuracy.  Even assuming you could carry that much accuracy through the standard trig formulae for Hc, you'd still be looking at an error of almost a degree!    Not very good if one is trying for minute accuracy.

    Lu Abel

    Greg Rudzinski wrote:
         Won a K&E 4080-3 on ebay and anxiously awaiting to receive it.
    I'm hoping that it is in good condition as described but you can never
    tell until the item is in hand. It will be interesting to compare
    solution times between the slide rule and pub 249. One advantage of
    the slide rule over pub.249 is that the dead reckoning position can be
    used as the assumed position.
    Thanks for your advice.
    On May 20, 8:51 pm, glap...@PACBELL.NET wrote:
    Here is a link where you can download the manual for the K&E 4080http://www.mccoys-kecatalogs.com/KEManuals/4080-3_1948/4080-3_1948.htm
    On May 20, 8:10 pm, Gary LaPook <glap...@pacbell.net> wrote:
    No advantage with two sliderules.
    Don't be intimidated by all the scales on these rules, most are LogLog
    scales that have no connection with celnav calculations. The important
    scales are simply the D, S, and ST scale for small angles.
    Greg Rudzinski wrote:
         It does appear as you have illustrated that the K&E 4080 has
    multiple advantages over the Pickett. Are there benefits to working
    with two slide rules together so that products can be transfered from
    one to the other and back again? If so then what types pair best?
    On May 20, 4:05 pm, Gary LaPook <glap...@pacbell.net> wrote:
    I like the K&E better than the Pickett because the S scale is adjacent
    to the D scale and the markings are more legible. Compare the yellow
    Pickett with the white K&E and also see my previous post.
    Greg Rudzinski wrote:
         You have succeeded in getting me interested in slide rules. I
    have never owned or used one but after some internet research I see
    that they have been to the moon and back. Now I will have to get one!
    So far I am leaning toward the purchase of a Pickett N3-ES which is of
    aluminum construction. The slide rule could very well be the pinnacle
    of low tech achievement. Right there with the mechanical chronometer.
    On May 17, 6:21 pm, glap...@PACBELL.NET 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.
    On May 16, 10:16 am, corallina <corall...@gmail.com> 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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