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    Re: Centring Error Detector
    From: Alexandre Eremenko
    Date: 2007 Jan 13, 11:50 -0500

    
    The prism set has another
    very substantial advantage in comparison
    with Star or Lunar distances:
    one can combine it with Franks
    laser beam proposal.
    Then the testing becomes independent
    of the observer's eyes.
    
    Bill and I found recently
    Frank's laser beam method works reasobably well
    for checking the Index error. If we had a set
    of prizms we could check the whole arc
    in the same way.
    
    I suppose this method is superior to other methods
    of checking arc errors because it does not involve
    collimators or any sophisticated and expensive equipment,
    just a set of prisms.
    
    Alex
    
    
    
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