By means of an array of gauges mounted beyond the open end of a shock tube, pressure-time records were obtained. The results indicate a tendency toward formation of a spherical wave front covering a wide solid angle at a distance from the end of the tube. When a pseudo-spherical front has been formed, similarities exist between the positive phase of pressure-time records obtained from free-air explosions and those obtained by this method but durations and pressure decay with distance do not scale with those of free-air explosions.
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