Bible Encyclopedias
Undulatory Theory
The Nuttall Encyclopedia
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.