Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: recommendation for slide rule ?
    From: Gary LaPook
    Date: 2009 May 21, 17:23 -0700
    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---.com> wrote:
    From: Greg Rudzinski <gregrudzinski---.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...{at}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...{at}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...---.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...---.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...{at}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...---.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



    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site