ON Nov. 20, 1926, NATURE published an article by me with the above title, in which I described an instrument which I had constructed in the year 1900, for investigating the progress of a lightning flash; and in the issue of Sept. 1 of last year I gave an account of the first successful photograph with it. This I obtained at the Loomis Laboratory in August last. In this later publication I indicated an improved form of instrument in which two films are carried past two fixed lenses at the same speed in opposite directions, so as to give rise to opposite aberrations of the two images of the flash. From the distortions of the images so found, the rate and mode of progress of the flash could be determined.
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BOYS, C. Progressive Lightning. Nature 124, 54–55 (1929). https://doi.org/10.1038/124054a0
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