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Title
Vintage illustration of the behaviour of a sound #215028131
Description
The Children`s Encyclopedia by Arthur Mee 1940s.Resonators of various forms have been devised with the object of making sound waves appear visible. In the type shown, a gas flame is made to rise and fall by the vibrations of musical notes. A four-sided mirror is kept revolving, and in this the flame is seen as a rapid succession of flickering tongues.
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