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John reminds me of my first experience with the whole horizon sextant
mirror, which I called the half silvered mirror, was that finding the
horizon in dim light was difficult. I found no advantages, in that the
sun and moon images can be seen in the clear part of the mirror, aiding
in bringing them down.

Now, if someone would make a horizon mirror that was half silvered on
only the left side, that might be worth something. But I might still have
the same problem at twilight, where I need all the light available to see
the horizon.

I'm sure that the article mentioned noted that half silvered mirrors (one
way glass) allow only a portion of the light to pass. When we remodeled
our bath, we had one installed in our shower for privacy. The room was
significantly darkened, and plants wouldn't grow. The amount of light
reduction is significant.

Jim Wilson
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