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> 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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