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I would like to make two comments about Jim's posts:
1.  Bigger mirrors do not give more light. (Is your image while
shaving with a large bathroom mirror brighter than with a small one?)
2.  Whole horizon mirrors do not divide the light.  They have a
specialized coating which transmits a large percentage of light,
while at the same time reflects a large percentage of light.

Ken
On Feb 22, 2010, at 11:40 PM, James N Wilson wrote:

> 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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