Abstract
IN NATURE for September 14 (p. 460), the writer on dark lightning refers to the absence of dark flashes in pictures of artificial discharge. I may perhaps draw the attention of any who are unfamiliar with Lord Armstrong's “Electric Movement in Air and Water” to Plate 34 in that book, in which is shown a very fine example of a dark flash. Lord Armstrong describes how he obtained the discharge on p. 41. Plate 18 is also of interest in this connection.
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STROUD, H. Remarkable Lightning Flashes. Nature 60, 520 (1899). https://doi.org/10.1038/060520b0
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DOI: https://doi.org/10.1038/060520b0
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