3D30.21 - Resonance Horns - Conical Pipes
The resonance horns are stamped with the frequencies that can be matched to the corresponding tuning fork. The whole point is that the resonance horn should isolate and resonate at the fundamental frequency of the matching tuning fork.
- Richard Manliffe Sutton, Demonstration Experiments in Physics, S-114 - Conical Resonator, p. 180.
- George M. Hopkins, "Speaking Flame", Experimental Science - Elementary Practical and Experimental Physics, p. 132
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