Bible Encyclopedias
The Nuttall Encyclopedia
Undulatory Theory
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The theory that light is due to vibrations or undulations in the ether as the medium through which it is transmitted from its source in a luminous body.
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Public Domain.
Bibliography Information
Wood, James, ed. Entry for 'Undulatory Theory'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/u/undulatory-theory.html. Frederick Warne & Co Ltd. London. 1900.