Diamond-glass Fluorescence


THAT fluorescence may result when a glazier's diamond is drawn over the surface of a pane of glass was shown by Foley many years ago (Science, N.S., vol. 13, No. 332, May 10, 1901). This phenomenon may be studied indirectly in two ways: (a) by ruling with a diamond on the back of a photographic plate, (b) by placing a clear glass plate on the film side and ruling on that. In either case on development a distinct darkened band will appear (if there was fluorescence) the width of which depends on the thickness of the glass plate that was ruled and the angle of total reflection. In (a) the affected portion of the film is of course on the under side next to the glass, and the development consequently is considerably slower than in (b), where the exposure is on the front side of the film. The angle of total reflection in either case is given by the relation

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KNIPP, C. Diamond-glass Fluorescence. Nature 120, 262–263 (1927) doi:10.1038/120262a0

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