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    Re: Dip-meter again
    From: Alexandre Eremenko
    Date: 2012 Mar 29, 22:20 -0400

    Lars,
    Yes, it does. The principle seems to be the same in all 3 devices
    discussed: 3 prisms or mirrors of which one rotates.
    Two prisms reflect the two almost horizontal rays to vertical
    rays, and the third one reflects both to a horizontal ray that is
    perpendicular
    to the first two.
    (After some thinking, I believe that the Soviet version also must
    have 3 of prisms/mirrors. The problem is how exactly you arrange the
    parts together
    to achieve high accuracy and easy adjustments.
    The differences between the US and Soviet devices are in the way
    the movable mirror is rotated.
    
    Alex.
    
    On Thu, 29 Mar 2012, Lars Bergman wrote:
    
    >
    > Maybe this article, from (the British) Journal of Navigation, 1950, vol. 3, 
    number 3, can be of interest. It contains, among other things, a description 
    of the principle of Pulfrich's dip meter.
    >
    > Lars, 59N 18E
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