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    Re: SNO-T tests
    From: Bill B
    Date: 2005 Nov 21, 19:00 -0500

    > Here is a sample of backlash measurements done with my 76 SNO-T at 0? altitude
    > sighting a not so distant power line.The instrument, although clean, could
    > have been regularly used when in service with the Soviet Navy and therefore I
    > would not be surprised if some wear had developped in the gears
    > I guess part of the results spread is due to the operator ageing eyes.
    
    JPP
    
    With my Astra (3.5X scope) and a power line, both clockwise and
    anti-clockwise averages are identical.  Which on the surfaces sounds good.
    
    BUT...  If I continue turning in the same direction for 0.2', it still
    appears in alignment.  It clearly leaves alignment between 0.3'and  0.5' of
    the first perceived alignment.  Using some fuzzy math, it would appear the
    the mean alignment approx 0.1' past the first perceived alignment.
    Therefore, my spread is 0.2', not 0.0'.
    
    Clockwise
    
    Touch     Leave
    
    57.8      58.0
    57.6      58.0
    57.6      58.0
    57.8      58.0
    57.7      58.0
    57.6      58.0
    Mean      Mean
    57.7      58.00
    
    Standard Deviation of touch 0.1
    Standard Deviation of leave 0.0
    
    Anti Clockwise
    
    Touch     Leave
    
    57.6      57.2
    57.8      57.4
    57.6      57.0
    57.7      58.2
    Mean      Mean
    57.7      57.2
    
    Standard Deviation of touch 0.1
    Standard Deviation of leave 0.2
    
    Bill
    
    
    

       
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