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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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