"Now, the velocity of wave propagation can be seen, without the aid of any mathematical analysis, to depend on the elasticity of the medium and its density; for we can see that if a medium is highly elastic the disturbance would be propagated at a great speed."

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Source : "Light Waves and Their Uses". Book by Albert A. Michelson. Published by The University of Chicago Press, pp. 23-25, 1903.

Albert A. Michelson

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