These measurements are presented as illustrative of the advances that have been made in the measurement of acoustic power. They refer of course to single cases, but they are of interest in showing the actual fluctuations of both components of impedance and of the power output in the three types of trumpets stated in the title.
Proceedings of the Iowa Academy of Science
©1926 Iowa Academy of Science, Inc.
Stewart, G. W.
"A Comparison of Power Output Conical, Hyperbolic and Exponential Trumpets,"
Proceedings of the Iowa Academy of Science, 33(1), 251-251.
Available at: https://scholarworks.uni.edu/pias/vol33/iss1/72