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    Re: "Vernier acuity" of horizon IC tests
    From: Bill B
    Date: 2009 Jul 08, 05:57 -0400

    > From: 
    >
    > You have reminded me that I did not say how I handled the micrometer. I always
    > brought the reflected image down to the direct image, in the direction of
    > increasing reading. In most sextants this places load on the thrust bearing of
    > the micrometer rather than on the axial pre-load spring and in theory at
    > least, gives more consistent results.
    
    Darn, you are good. I always considered the difference in accuracy from
    turning the drum away vs. toward to the use (touch and feel) of the thumb vs
    the forefinger! Also resting a finger on the arc, which doesn't really
    concern me with the Astra IIIB.
    
    Bill B.
    
    
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