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On the subject of whether muliple reflections within a back-silvered glass
mirror give rise to multiple images, Fred Hebard wrote-

| Hmm, I wonder if this shows up in artificial horizons, which is where
| I recall (vaguely) having seen it?  No time to check now, but I'll see.

Well, it shouldn't, if they are made of decent glass, with the two surfaces
really parallel. However, larger pieces of glass are usually used for the
roof of an artificial horizon, and so there might be a temptation to use
poorer quality than for a sextant mirror. Even so, I would be surprised if
the glass was bad enough to have enough "wedge" shape in it to produce the
multiple images that Fred mentions. As he says, we'll see, when he reports
back on his reflected sky images.

On the other hand, if he uses a transparent liquid, such as plain water, and
the bottom of the tray it's in is shiny, and not quite horizontal, then he
will see multiple images from those different paths.

George.

contact George Huxtable at george@huxtable.u-net.com
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.



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