Thread: Sir J. Herschel's definition mirror quality
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Old 03-06-2010, 06:33 PM
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Brian W (Brian)
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Sir J. Herschel's definition mirror quality
Hi all, @1850 Sir J. H. wrote that if one could see '6' stars in the Trapezium then one had a quality mirror. Has optical performance greatly improved or is this still a good working definition of a fine mirror?

Brian.
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