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An account has previously been given of some results obtained with the Boys camera in the study of lightning discharges and of some deductions as to the nature of these discharge. The present paper is concerned with further studies in the same field with improved technique and apparatus. The material now available includes 41 photographs comprising 95 separate flashes and over 200 lightning strokes. These have been obtained from 13 different thunderstorms over a period of three years, and may therefore be considered to offer a fair sample of the lightning discharges of Southern Africa. We have derived from them a general picture of the nature of the discharge and the manner of its development which seems to be valid for the great majority of the cases studied.
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Schonland et al. (1935) studied this question.
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