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>
>At the point where you have set aside the welder's glass, and swung in the
>dense shade in the index-mirror view, you still have the full brilliance of
>the Sun in the horizon-mirror view. Unless you introduce a similarly dense
>shade into that direct view, your eye will be quite unable to take it. But
>if you do that, you are measuring, not the error of the upper shade, but
>the combined error of two shades (just as Lecky described), which was NOT
>the object of the exercise.

George, are you able to remove the index mirror shade and rotate it  - even
using plasticene or some other jury rig to hold it in place while you see
if the IC has shifted....?

Geoffrey Kolbe

   

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