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

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    Re: Traditional navigation by slide rule
    From: Stan K
    Date: 2016 Jan 7, 17:30 -0500
    FWIW, my Pickett N1010-T has the inverted second tan scale, but my Pickett N4-ES has the non-inverted second tan scale.

    Stan


    -----Original Message-----
    From: Gary LaPook <NoReply_LaPook@fer3.com>
    To: slk1000 <slk1000---.com>
    Sent: Thu, Jan 7, 2016 2:07 pm
    Subject: [NavList] Re: Traditional navigation by slide rule

    The most useful scale found on yours and not on the K&Es is the second tan scale starting at 45 degrees. Without this second tan scale you end up needed some tricks when dealing with angles greater than 45 on the K&E.  My Pickett N 3-T and my Pickett N 3-ES and even the cheap Stirling have the second tan scale. (Actually, the K&E does have a second tan scale but it is inverted so requires different procedures when using it, I don't understand why K&E did it this way.)

    gl




    From: John Brown <NoReply_JohnBrown@fer3.com>
    To: garylapook---.net
    Sent: Thursday, January 7, 2016 7:04 AM
    Subject: [NavList] Re: Traditional navigation by slide rule

    Attached is a pic of my Blundell Harling Super Duplex Academy 504 - sea navigation model, as endorsed by Podmore. Unusually for a UK made slide rule the trig functions are on the slide. They are divided sexagesimally, which I find slightly inconvenient with my no longer perfect eyesight.
    John


    Attached File:

    (Blundell_Harling_SuperDuplex.jpg: Open and save)



       
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