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    Re: Automated Sun detector
    From: Geoffrey Kolbe
    Date: 2007 Dec 09, 14:56 +0000

    Richard wrote [NavList 4269]
    >About fifty years ago I had a summer job at an agricultural research
    >station.  One apparatus was basically a crystal ball on a stand, "burning"
    >a path for the day on a tilted half cylinder of paper.  I think the paper
    >automatically notched upward each night . . . but it has been quite a long
    >time ago for all the details.  Cloudy sky didn't make a good mark, but
    >bright sun was clearly evident.  Seemed like a simple way to get the
    >number of sunshine hours at a given location.
    The Campbell-Stokes sunshine recorder to which Richard refers was invented
    back in 1835 and is still on the standard list of meteorology equipment.
    Brand new, they cost some thousands of dollars and pretty much the same in
    pounds. But glass balls of a good size can be had at a reasonable price,
    see http://www.mineralcraft.com/acatalog/Glass_Spheres.html and the special
    card on which the sunshine hours are recorded can be obtained from
    A frame to hold it all together should make a nice little project. I think
    Mike could probably have his very own automated sun detector with change
    out of thirty quid!
    Geoffrey Kolbe
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