330-PSA-134-60 (USN 1049122):   Blast Cone Principle.  This diagram illustrates how a small charge shock wave will expand within the confines of a cone in the same manner as it would if it were part of a full sphere of explosive.  This small charge fired in the apex of smoke represents a much larger explosive charge fired in the open.   Photograph released August 1, 1960.   (8/25/2015).
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