I don't remember having one degree errors when calculating Hc on a 10 inch rule, usually nin the one or two tenths range. Off course it depends on where on the scale you end up as the spacing of the markings vary greatly.
gl
--- On Thu, 5/21/09, Greg Rudzinski <gregrudzinski@yahoo.com> wrote:
From: Greg Rudzinski <gregrudzinski@yahoo.com>
Subject: [NavList 8367] Re: recommendation for slide rule ?
To: "NavList" <NavList@fer3.com>
Date: Thursday, May 21, 2009, 5:19 PM
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 <lu...@abelhome.net> 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 <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.
>
> >>> 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
<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.
>
> >>>>> 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
<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.
>
> >>>>> IMGP5885.JPG
>
>>>>> 187KViewDownload
>
> >>>>> IMGP5887.JPG
> >>>>> 186KViewDownload
>
> >>>>> IMGP5888.JPG
> >>>>> 187KViewDownload
>
> >>>>> IMGP5897.JPG
> >>>>> 186KViewDownload
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