Role of Edgetone Action in an Organ Pipe
Alan Powell · The Journal of the Acoustical Society of America · 1962
The characteristics of the action for a certain edgetone geometry have been previously carefully determined [J. Acoust. Soc. Am. 33, 395 (1960)]. A family of lengthwise, symmetrical, “double” open-ended organ pipes have been designed so as to incorporate this edgetone geometry. The design is, consequently, somewhat unconventional, and it displays certain interesting and predictable features not normally present in conventional organ-pipe operation. These reveal how the organ tone depends both on the stage of the “edgetone” action and on the mode of pipe resonance, there being downwards, as well as upwards, jumps in frequency as the jet speed is increased. In addition to the prediction of the major frequency characteristics, it is also shown how the sound intensity can be estimated to an acceptable degree of accuracy. [This work received the partial support of the Office of Naval Research, under contract.]