Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Bubble sextant trials
    From: Alexandre Eremenko
    Date: 2007 Feb 15, 14:27 -0500

    Dear Jean-Philippe,
    1. The sextant is "right out of the box".
    With one exception: the bulb illimination originally did not
    work. Trying to fix the problem I first inspected the switch.
    The switch was OK. Then I disassembled the sextant into two halves,
    and found that the bubble illumniation is wired through the averager.
    I opened the averager, but could not see where the problem is,
    and did not want to meddle with its complicated mechanism.
    So I just shortened the bubble illumination, so that now it
    does not go through the averages, but only through the switch.
    2. I did not do any adjusting, including Index error, and I do not
    know how. Interestengly, there is a label on the box that says that
    index error is zero:-)
    3. Unfortunately, not all my observations are so good as posted:-(
    I just posted the first successful Sun observation, just after two
    preliminary trials to see how it works.
    But the same evening I tried some stars,
    and was sometimes 3-4 minutes
    off. The problems I see so far are the following:
    a) the bubble illumination is not bright enough and not uniform.
    b) the bubble grows as I observe. Small bubbles come from time to time
    from the 10 oclock place in the field of view (the usual birth place of
    the bubble) and join the main bubble which as a result increases is size.
    So I have to adjust the bubble frequently.
    P.S. It is also terribly cold in Lafayette now:-)
    With all my warmest
    cloth on I cannot stay on the balcony for an extended
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to NavList-unsubscribe@fer3.com

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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