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
    Name or NavList Code:
    Email:
       
    Reply
    Re: slide rule
    From: Paul Hirose
    Date: 2010 Apr 27, 11:43 -0700

    Hewitt Schlereth wrote:
    >
    > Shufeldt's skide rule is a Keuffel & Esser Log Log Duplex Trig. Log
    > Log means it has logarithm scales. Duplex means it has scales on both
    > sides. Trig means the trig scales are in degrees and minutes.
    
    His rule is one of the K&E 4080 family, a good choice for someone
    wanting to get into slide rules nowadays, since it's got a full
    assortment of scales for science and engineering, yet is plentiful and
    affordable on eBay. I wrote about it at some length last year:
    
    http://www.fer3.com/arc/m2.aspx?i=108309
    
    Keuffel & Esser completely changed their numbering system in the early
    1960s. A 68 1256 is equivalent to the earlier 4181-3.
    
    The years of the deteriorating plastic in the top and bottom cursor bars
    are not precisely defined; I've read that K&E changed to an improved
    plastic as late as the late 1940s. As far as I know, the rules with
    all-plastic bodies used the later material and had no problem. One of my
    4181-3s was awarded as a prize by the Texas Chemical Council in 1963,
    and looks brand new. (Apparently the recipient already had his favorite
    slide rule, and never used the prize.)
    
    I believe all Pickett rules use decimal trig graduations, so would not
    be suitable for the original poster.
    
    On the other hand, most simple slide rules with the classic 9-scale
    arrangement seem to have used degrees and minutes. This would include
    the K&E 4053, Post 1452, and Sterling Precision.
    
    --
    
    
    
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

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

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

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

    Email Settings

    NavList ID 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