John Tyndall FRS (2 August 1820 - 4 December 1893) was a prominent 19th century physicist. His initial scientific fame arose in the 1850s from his study of diamagnetism. Later he studied thermal radiation, and produced a number of discoveries about processes in the atmosphere. Tyndall published seventeen books, which brought state-of-the-art 19th century experimental physics to a wider audience. From 1853 to 1887 he was professor of physics at the Royal Institution of Great Britain, where he became the successor to positions held by Michael Faraday. [wikipedia]
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"Vibrate string allowing nodes to oscillate will cause additive synthesis of vibrations in string to increase beyond initial input."