Abstract
The Mach wave observed near regions of supersonic turbulent flow will eventually develop into spherical waves. Such waves are evident in currently available shadowgraph pictures of the flow near high-velocity model jets. The work described is aimed at understanding the development of these waves from their quadrupole origin and, for simplicity, the theory is worked out for a single point quadrupole. No effect of finite amplitude is considered. The simple theory seems to imply that the observed spherical waves are indeed the Mach waves at a later stage of development and this development is described. [Research supported by the National Aeronautics and Space Administration.]
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