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Eng:nTringProcess development fluctuations in the frequency range under consideration appears to be valid. It TTas noted above that the difference In amplitude between the pressure fluctuations associated with the length of duct for cold and hot flow could not be immediately accounted for. However, it is apparent that the coupling between the fuel injector and the burner might well act as an amplifier so that the initial amplitude of the duct tone could be increased by interaction with the fuel injector, thus providing larger ainplitudes under burning conditions. I n general, the amplitude of the pressure fluctuations in the range 100 to 120 cycles per second was somewhat larger Ivith injector I11 than with injectoi I1 (Figure 8). It is also interesting to consider the possibility of using a ducted burner of the type herein discussed as an audio amplifier by means of modulating the fuel flow. If the frequency response of the burning process to changes in fuel flow is sufficiently high, it would seem that amplification factors of considerable magnitude might be obtainable over n useful range.ACKNOWLEDGMENT iLIany members of the staff of Experiment Incorporated have contributed to this study. To all of these the authors extend their thanks. I n particular, however, they are indebted to James W.

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