Directional distribution of ambient sea noise

Observations of the directional distribution of ambient sea noise are reviewed, for depths of 100 to 1000 feet, in the octave 0.75 to 1.5 kc/s, obtained with a 32-element spherical array yielding 32 simultaneous beams covering all directions in three dimensions. The results are presented diagrammatically. An appendix contains a description of the DIMUS bea m-forming system (clipping and shift-register delays) which is employed.