Akustik II / Acoustics II by R. W. Leonard, A. Barone, Rohn Truell, Charles Elbaum, B. E.

By R. W. Leonard, A. Barone, Rohn Truell, Charles Elbaum, B. E. Noltingk (auth.)

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New York: D. , Inc. 1926. Handbuch der Physik, Bd. XI/2. 3a R. W. LEONARD: Generation and Measurement of Sound in Gases. Sect. 18. is quite evident. Fig. 53 shows relative free-field pressure response in decibels vs. frequency in cycles per second for an early electrodynamic microphone designed by WENTE!. The dashed curve indicates the decrease in sensitivity to be expected when the back cavity is vented through a very high flow resistance vent. The high-frequency end of the curve has some residual irregularities due to resonance in the air space under the diaphragm which are not taken into account by the equivalent circuit of Fig.

Mitt. schweiz . Telegr. u . ·Yerw. 6. The acoustic energy from explosions. Sects. 14, 15. 33 25 X 10- 3 kg/cm 2 • At pressures equal to and below this, the velocity head or stagnation pressure of the explosive gases was observed to be neglibible compared to Po since the measured value of Po was found to be independent of the orientation of the sensitive surface of the microphone. 01 kg/cm 2 , and the velocity of propagation was only 4 % higher than the normal velocity of sound. 14. Sound waves from guns.

Small area subsonic jets are not effective sound Fig. 39. A jet-edge system in section (after NYBORG). sources unless they inpinge on an obstacle. One of the basic systems is the jet edge combination where a thin, essentially two-dimensional jet of air strikes a sharp edge. The edge is coplanar with the jet as indicated in section in Fig. 39. The jet edge system was studied by SONDHAUS3 over a century ago. Since that time, many investigators have been interested in "Schneidentone". BROWN 4 has reviewed the literature up to 1937, and in addition has presented an empirical formula for the frequencies of the jet edge system for its various stages of operation (regions of instability in flow).

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