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
    Non-adjustable sextant error calibrations
    From: Doug Royer
    Date: 2004 Feb 2, 14:57 -0800

    After reading Joel's post I started to think about this matter.Frank started
    a thread(part 1 of 2) on measuring the angles between stars to find error.I
    was interested in the subject but didn't persue it further untill part 2 is
    written.However,after Joel's post I wonder if one can calibrate the
    instruments' non-adjustable error useing this or some other method.
    Doesn't collumation error have to do with the alignment of the scope to the
    frame?I've read in some book also,that to check collumation one places a
    grid a certain distance from the sextant and scope and checks for the error
    in that way.I'll have to dig around in these books to find if that is what
    was being written about.
    I've read in older nav. books a procedure called "interstellar angles" or
    some such.There was even a table with angles between stars(such as Sirius to
    Spica,Spica to Aldebahran etc.)that spanded close to long angles to measure.
    My question is : is this the method one can use to find or calibrate the
    non-adjustable error that Fred states?
    As I posted awhile ago I took my sextant into Baker Marine years ago(when
    they offered this service)to have the arc error checked(for a healthy
    sum)only to find out it was well in spec < 10" of arc over the entire arc of
    130*.So,because of the cost of this couldn't Fred or any of us use this or
    some technique to find the error in some of the older sextants that state
    the error on the certification papers inside the sextants' box?
    
    
    

       
    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