Abstract
I HAVE a greenhouse facing nearly due south. In a vertical pane of glass there is an imperfection. When the sun shines on this pane no light is transmitted through the imperfection. The result is that on a board or piece of paper held at right angles to the sun's rays there is produced an intense black disc about 1 inch in diameter, the board being held about 8 inches from the glass. This black disc is margined all round by a very narrow, brilliantly white line.
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P., V. An Optical Phenomenon. Nature 80, 398 (1909). https://doi.org/10.1038/080398a0
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DOI: https://doi.org/10.1038/080398a0
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