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
    Sextant Project
    From: Greg Rudzinski
    Date: 2008 Mar 28, 15:31 -0700

         Last year I set out to locate a Plath sextant that could provide
    parts for my U.S. Navy MK 3 M.Low. Daily watching of Ebay finally
    produced a Plath which was not functioning according to the owner.
    Upon receiving the Plath it became immediately apparent that this
    instrument was too good to cannibalize even though the sextant looked
    like it had spent the night with the Sampsonite Luggage gorilla. The
    first order of business was to completely disassemble the sextant then
    soak the arc in ammonia. Scrubbing the arc with an old toothbrush
    removed all the built-up corrosion. The mirrors and filters only
    needed a wipe down with alcohol. No saving the 4x40mm scope so the
    lenses were removed to create a sight tube. No saving the lighting
    system either.  Everything went back together as it came apart.
    Working the micrometer drum through the entire arc repeatedly with
    light oil helped to smooth out the operation of all the moving parts.
    A last touch was to strap on a digital watch to the sight tube with 24
    hr. GMT displayed. Finally I was off to the beach for calibration and
    testing. Observed LOP intercepts were within 3 nautical miles GPS .
    This instrument has now become my traveling small craft sextant and
    sees more action than my three other sextants combined.
    
    Lesson learned- One sextant project in hand is worth two on Ebay.
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    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