An experiment illustrating harmonic undertones.
Herbert Knapman · Proceedings of the Royal Society of London · 1905
Abstract The object of this note is to ‘describe a phenomenon of which, as far as I have been able to learn, no published account has hitherto been given, although perhaps its extreme simplicity renders it unlikely that it has altogether escaped detection. If a vibrating tuning-fork is pressed against a light object, such as a piece of paper or a stretched string, this object will in general follow the vibrations of the fork until they die away, remaining in contact with the fork all the time. This method of using a tuning-fork is mentioned in Lord Rayleigh’s “Theory of Sound,” § 133.