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    Re: recommendation for slide rule ?
    From: Greg Rudzinski
    Date: 2009 May 21, 17:19 -0700

    Lu,
    
         One degree of error disqualifies the slide rule method. Hopefuly
    I can do better than that. I will be experimenting to see what my
    aging eyes can do. A magnifying glass might improve accuracy. I am OK
    with one tenth of a degree of accuracy.
    
    Greg
    
    On May 21, 3:23�pm, Lu Abel  wrote:
    > Greg:
    >
    > 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:
    > > Gary,
    >
    > > � � �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.
    >
    > > Greg
    >
    > > 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
    >
    > >> gl
    >
    > >> On May 20, 8:10 pm, Gary LaPook  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.
    >
    > >>> gl
    >
    > >>> Greg Rudzinski wrote:
    >
    > >>>> Gary,
    >
    > >>>> � � �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?
    >
    > >>>> Greg
    >
    > >>>> On May 20, 4:05 pm, Gary LaPook  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.
    >
    > >>>>> gl
    >
    > >>>>> Greg Rudzinski wrote:
    >
    > >>>>>> Gary,
    >
    > >>>>>> � � �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.
    >
    > >>>>>> Greg
    >
    > >>>>>> 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.
    >
    > >>>>>>> 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.
    >
    > >>>>> �IMGP5885.JPG
    > >>>>> 187KViewDownload
    >
    > >>>>> �IMGP5887.JPG
    > >>>>> 186KViewDownload
    >
    > >>>>> �IMGP5888.JPG
    > >>>>> 187KViewDownload
    >
    > >>>>> �IMGP5897.JPG
    > >>>>> 186KViewDownload
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