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...
    RES: Recharging Compas Magnet
    From: Jos� Otavio O. de Almeida
    Date: 2004 Jun 20, 15:55 -0300

    You can recover the compass by applying a strong manetic field on it. You
    can do that by winding a coil around the compass, and applying DC
    (continuous current) on it. The coil plane should be perpendicular to the
    plane of rotation of the compass. The compass "needle" should be left free
    to rotate, so that when you apply dc to the coil, it will align itself to
    the magnetic field generated.
    Try, say about 50 turns of AWG 24 or 28 wire, and apply 12v DC from a car
    battery. The contact should be brief, less then a second, as the current
    will be very high, almost a short circuit. If you leave it connected it will
    generate a lot of heat and burn.Just scratch the contact a few times, that
    shoud do it.  Jos? Almeida.
    
    -----Mensagem original-----
    De: Navigation Mailing List
    [mailto:NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM]Em nome de Zvi Doron
    Enviada em: domingo, 20 de junho de 2004 04:47
    Para: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    Assunto: Recharging Compas Magnet
    
    
    Hello,
    
    I have a small emergency field compass that was kept unused in a pocket on
    my mountain bike for the last 10 years. I took it out recently and
    discovered it had become very sluggish.  I suspect that the magnet under the
    compass card has lost much of its power and canot overcome the friction
    between the compass card and the needle it floats on. I cannot open it to
    get to the needle and clean its tip.
    
    Is there a way to recharge the magnet? I tried placing the compass overnight
    on magnetized objects like my phone handset or a large screwdriver but I
    suspect I need a stronger source of magnetic field. A 220V wire leading to
    an operating house appliance perhaps?
    
    Any advice would be much appreciated.
    
    
    

    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