Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
    WWII bubble sextants and radium
    From: Chris Caswell
    Date: 2017 Mar 20, 15:14 -0700

    I discovered a month or so ago that some of the sextants used radium paint to illuminate the bubble for star shots-from what I can gather, it is probably Ra-226, which has a half life of around 1600 years. The sextants that I own that are hot are: the Bausch and Lombe AN5854-1 and A8-A, the Bendix AN5851-1, and the Pioneer MK IV, which is the hottest of all.  I purchased a Lionel CDV-700 radiation meter, and after measuring background radiation, arranged my sextants so my working and sleeping space are at or near background. (I live in one room) If you collect these instruments, you might want to keep them away from your living spaces.

    Chris in VT

    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