LAST September you kindly published a photograph of a multiple lightning flash taken with a moving camera. I now enclose a photograph taken at Johannesburg by Mr. G. H. Preston. I think that he must have moved his camera (Frena) unintentionally, being startled at the commencement of a very vivid flash, which seems to have lasted some considerable time, say nearly one second. At any rate there are nine distinct lightning flashes, all of identical shape. The first three, or perhaps a few more, are very strong and close together, and possibly while they were taken the camera may as yet have been fairly stationary; its axis then moved in spiral curves while the remaining six flashes imprinted themselves.