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: Traditional navigation by slide rule
    From: Rommel John Miller
    Date: 2016 Jan 6, 21:57 -0500

    Some nitpicking by me

     

    The C and D scales on a slide rule take three forms.

     

    C&D Themselves

    CF and DF where the  F signifies the line is folded over.  That is to say C and D both begin and end with Pi. 

     

    CI and DI (not 1) Are inverted, which is to say reflection of the C&D scales.

     

    CIF is a funny scale in that it is inverted and folded and the left index is 3.5 and the right index is 3.1  on the K+E Log Log Duplex Decitrig 3.1 is thus the right index in that it extends past what would be the traditional place of terminus for the C or D scales. 

     

    If you have a slide rule that has an inverted and folded C scale (CIF) look at it. 

     

    This site http://www.sliderules.info/a-to-z/scales.htm

     

    Does a pretty good job of describing the scales on a just about all scale rules out there.  Note that I am not lying when I say it is NOT C1 but CI. 

     

    Thanks

     

    Rommel John Miller

    8679 Island Pointe Drive

    Hebron, MD  21830-1093

     

    410-219-2690 (Land and Home)

    443-365-7925 (Cell)

     

    rommeljohnmiller---.com

    rommeljmiller{at}outlook.com

     

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of David Pike
    Sent: Wednesday, January 6, 2016 4:40 PM
    To: rommeljohnmiller---.com
    Subject: [NavList] Re: Traditional navigation by slide rule

     

    Bob Goethe sent some photos http://fer3.com/arc/m2.aspx/Traditional-navigation-slide-rule-Goethe-jan-2016-g34055

    That’s a mighty slide rule Bob. For one who only ever managed to just scrape through in higher Maths, please confirm what all the scales are.  Starting from the backside from bottom up my guesses are:
    LL2 = e superscript 0.1x
    LL3 = e superscript x
    C&D = x
    C1 = 1/x
    C1F = just a guess 1/pi x
    CF = just a guess pi x
    LL1 = just a guess e superscript 0.01x

    L = log base10 x

    Front side from bottom up
    Sh1 = just a guess sinh-1 some scale on there? Small angles
    Sh2 = just a guess sinh-1 some scale on there? Larger angles

    Th = just a guess tanh-1 some scale on there?
    D = x
    S = sin-1 x
    ST = sin-1 x or Tan-1 x Very small angles
    T = tan-1 x
    A&B = x squared

    LL00 = very much a guess e superscript 0.000x
    LL0 = very much a guess e superscript 0.00x
    Many thanks.  DaveP

    View and reply to this message

       
    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