Abstract
THE accompanying photograph (Fig. 1) was taken by me some years ago during the construction of the Shirawta Dam, Bombay Hydro-Electric Works, India. It shows a curious fracture surface due to a heavy gelignite detonation in finely crystalline “trap” rock. So far as I can remember I had seen other examples of this phenomenon, but photographed this as it was a particularly good one, and I thought it would be of special interest to “elasticians.”
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