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Sorry to be thick as a brick on this.  I did find an article Frank had
posted, "Sextant Telescope Collimation," 10-18-05

I guess my handicap is not being able to translate the word picture into a
mental image.

If I superimpose two images in the center of the scope and keep the
directly-viewed image centered and rotate around scope's axis, the image
viewed via the index mirror will slide left or right using a plumb sextant
frame as a reference.

What I suspect is a movement more like assembling a panoramic from several
camera photographs.  If the scope had cross hairs, when the sextant frame
was in the normal plumb position, we could label the horizontal cross hair
"x" and the vertical crosshair "y".  With the two images superimposed at the
crosshair junction, the "rotation" motion needed would slide the bodies to
either side of the y crosshair while keeping them on the x crosshair.  Equal
distance from the y crosshair of the image nearest the y crosshair should
create equal separation between the bodies.

Do I have it yet?

Thanks for your patience.

Bill


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