ACOUSTICS TESTS IN PUERTO RICO.
NAVAL RESEARCH LAB WASHINGTON D C
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The results of a field test to determine the directional characteristics of acoustic waves propagated through a jungle from overflying aircraft are presented. In general, when aircraft are directly over the test site, the sound at a point 20 ft. above the ground arriving from the direction of the ground measures about 6 dB lower than sound arriving from overhead. As the aircraft becomes further from the test site, the difference becomes less. Author
- Electrical and Electronic Equipment