＜正＞ This paper presents a preliminary dynamic photoelastic investigation on millisecond blasting. Millisecond blastings with different delay time and the simultaneous blasting of two charged holes are simulated to discuss the mechanism of millisecond blasting and the comparisons between millisecond blasting and simultaneous blasting. Also the selection of delay time is developed.
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机译：Flt.-Lient. R. G. Veryard, B. Sc., R. A. F.: A Preliminary Study of a Toronado at Peshawar (トルネドー研究序报). India Met. Dep. Vol. V, No.56, 17th June. 1933.
