The "New Tone Generator" designed by Dr. C. W. Hewlett promises to be a very valuable instrument for use as a precision source of sound. The operation of the instrument has been investigated mathematically by its designer and a method is given for calculating the amplitude of vibration of its diaphragm from the electrical input. The writer herein describes a method whereby it has been possible to make actual measurements of the amplitude by mechanical means for comparison with the calculated amplitudes. The tone generator was used in a vacuum tube oscillatory circuit from which the desired frequencies of alternating current were obtained.
Proceedings of the Iowa Academy of Science
©1921 Iowa Academy of Science, Inc.
Lane, C. E.
"Measurements of the Amplitude of Vibration of the Diaphragm of the Hewlett Tone Generator,"
Proceedings of the Iowa Academy of Science, 28(1), 83-88.
Available at: https://scholarworks.uni.edu/pias/vol28/iss1/15