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    Re: HR1 Sliderule locking mechanism questions
    From: Brad Morris
    Date: 2013 Feb 10, 15:50 -0500

    Hi Robin

    The knob sinks towards the non moving portion but only very slightly so.  Perhaps a 1/64th of an inch.  This could also be non-parallel surfaces.  I'd hate to say its definitive

    As to scale pictures, I don't mind.  The tricky bit is that one scale (ruler) is flat and the other is cylindrical.  One or the other won't be in focus.  Why don't we try one or two to start.

    Please identify two places on the scale you would like to most investigate.  I'll do my best to take a picture. 

    Best Regards

    On Feb 10, 2013 1:48 PM, "Robin Stuart" <robinstuart@earthlink.net> wrote:

    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,
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