Sounds were recorded by means of band microphone, 7stage resistance-capacity-coupled amplifier and oscillograph; bomber; chaser, reconnaissance machine and small dirigible were investigated; factors determining characteristics of sound are discussed.
The analysis of the sounds emitted by aircraft
Aeronautical Research Inst. Tokyo Imperial Univ. -- Report
1930
43 pages
29 Figs. and 15 Plates
Aufsatz (Zeitschrift)
Englisch
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