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    Re: Irradiation
    From: John Huth
    Date: 2010 Feb 27, 12:43 -0500
    Marcel -

    Next time, I may have them do that.   I didn't set out to test this effect, but stumbled on it after we'd gone through the exercise and analyzed the results.   It was an interesting exercise - I like your suggestion.   I'll add it in next time.

    John H. 

    On Sat, Feb 27, 2010 at 12:32 PM, Marcel Tschudin <marcel.e.tschudin@gmail.com> wrote:
    On Sat, Feb 27, 2010 at 7:20 PM, Apache Runner <apacherunner@gmail.com> wrote:
    > In my case, we weren't limited by refraction.
    > I had the students measure the angular height of a steeple that was only a
    > mile distant, and they systematically overestimated the height by a
    > significant amount, yet the refractive effects were small.   I could imagine
    > that there are many ways of taking out refraction as a factor, this would be
    > one of them.

    OK, yes. However, remembering the difficulties the surveyors
    encountered when measuring heights, it might even have been preferable
    to do this exercise by having them measured the width of the steeple.


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