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I repeated the experiment, this time blocking the horizon mirror's clear
window from the front.  Not surprisingly I guess, for all 3 sighting devices
(sight tube, 4.5x30 and 6x40 telescopes) I only saw the index mirror's image
in the right half of the field of view, and it stopped sharply at the center
of the field of view where the vertical edge of the mirror ended.

For what it's worth, I again blocked the clear window from behind and
studied the slightly dimmer index mirror's image that showed past the center
line in the left half of the field of view.  I could only perceive a single
image reflecting from the clear window, but I don't know how precise that
would be.  I don't know whether I could pick up two images (one from the
front of the horizon glass and one from the back) with the resolution of my
biophysical optics, if in fact there are two images spaced very slightly
apart vertically in the left field of view.  I was looking at a series of
horizontal black electric lines against blue sky about 200 yards away, using
the 6x30 telescope.

Jim Thompson
jim2@jimthompson.net
www.jimthompson.net
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