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
    The trig scales on K & E 4070-3 and 4080-3
    From: Alan S
    Date: 2017 Nov 29, 13:35 -0800

    Gary LaPook

    As memory serves, you had a recent article on using the slide rule in celestial navigations calculations, making particular reference to the use of slide rules whose trig scales read in degrees and minutes, rather than degrees and decimals, the more commonly encountered. Amongst seveal slide rules I have are the above mentioned, which read in degrees and minutes. Re them the following question. Looking at the S scale, with my old eyes, it appears that the scale is calibrated so that degrees and 30 minute increments are directly read, and 15 minute increments can be estimated accurately in 1 part of the scale. Other parts of the S scale can be read to 10 minutes, with 5 minutes estimated. The T scale seems similarly "loose". I presume that, as a practical matter, this degree of accuracy is adequate, though it seems "loose" to me.  Might I here be beating the proverbial dead horse? At your convenience, give me a shout please.

    Happy holidays to you and yours.

    Alan

       
    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