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Bill,

> With a large flat tip it will
> measure the high points along the arc and not dip into the teeth.

I see. Then the problem is how to attach it to the arm rigidly.

> Easily done if a magnetic base could be used, but alas....

??? Sextants are not made of iron. They are non-magnetic.

> My method would secure the arm and move the frame.

How do you imagine securing the arm? You also need to secure your
measuring devise, so that it does not move with respect to arm.

> case you measure the distance from the pivot point to wherever the tip of
> the dial indicator is located on the arc.

That is the excentricity.
Though I am very sceptical. Yoiu have to secure the arm and the
gauge to the same firm foundation (how?) and be sure that the
gauge is oriented towards the pivot of the arc.

> Again, I am not clear this is the measurement you are looking for.  My
> reading is you want the distance from a given point on one tooth to the
> next.

That's what I originally wanted. But then again you have to secure the
gauge to the arm.

Alex.

   

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