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: HR1 Sliderule locking mechanism questions
    From: Wolfgang Hasper
    Date: 2013 Feb 10, 21:10 +0100

    I am still curious as to what mechanism is behind the
    original tube lock...
    Pondered it quite a while. The apparent sensitivity to
    a special adjustment makes it unlikely that my cam
    idea is the true explanation.
    I thought about a set of radial knee levers that could
    offer the advantage of giving an inherently stable
    locked position...?
    Brad, from the feel of the locking process is there any
    indication of how it might work?
    Gary's sqeezed-rubber stopping mechanism seems to
    present an unlikely explanation as apparently these
    locking mechanisms work even after 70 years when
    rubber has usually turned hard and unflexible...
    Any suggestions welcome.
    Best regards
    Am Sonntag, 10. Februar 2013 19:48 schrieb Robin
    > Brad,
    >     Thanks very much for the HiDef photos and
    > explanation. Please don't do anything that would
    > damage your treasure. Does the height of the locking
    > knob rise when turned from the fully unlocked to
    > locked position? If so this would indicate that it
    > is on a screw probably pulling a tapered plug into a
    > constriction at the base of the (co)tangent tube as
    > opposed to turning a cam which was a solution that
    > Wolfgang Hasper had implemented, Regards,
    > Robin
    > ----------------------------------------------------
    >------------ NavList message boards and member
    > settings: www.fer3.com/NavList Members may
    > optionally receive posts by email. To cancel email
    > delivery, send a message to NoMail[at]fer3.com
    > ----------------------------------------------------
    > View and reply to this message:
    > http://fer3.com/arc/m2.aspx?i=122311

    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