N-A.C.A, Technical Memoraaidain No* 692 Figs. 4,5,7,8 Fig. 4 Anemometric wire mounted on "base. Pig. Anemometric wire with cover. i • • • ■ • 1 • i • • • • • • t i • • ■ • • • t ■ •••••■•■■tti Pig. 7 Hot wire anemometer record of periodic variations in speed produced by the sound waves at the mouth… … Fig, 8 Oscillograph record of fundamental sound of an acoustic pipe, (130 periods per sec.)
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