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    Re: Advice concerning sextants
    From: James N Wilson
    Date: 2010 Feb 22, 21:40 -0800

    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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