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    Accuracy from sun-stone?
    From: Richard M Pisko
    Date: 2011 Dec 16, 23:51 -0700

    re: Apache Runner's question
    I was waiting to see if anyone with access to the Proceedings of the Royal
    Society would offer more of an explanation.  My public library does not
    subscribe to the Proceedings, but might be able to get something through
    an interlibrary loan.
    However, I am reminded of "Bunson's Grease Spot Photometer" . . .
    certainly simple and accurate if there are two light sources to be
    compared simultaneously . . . but I wonder how this could be applied to an
    Icelandic Crystal.  Perhaps with prisms?
    Any ideas, or have you found more information from other sources?
    A similar question was automatically rejected Nov 27.
    Richard . . .
    Using Opera when "the Dog" died.

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