According to Lord kelvin, each centimeter of shrinkage in the sun's diameter furnishes the energy required to keep up its radiation for something more than an hour, and, on account of the sun's great distance, the shrinkage might go on at this rate for many centuries without producing any measurable effect in the sun's appearance.
"A Text-Book of Astronomy"
George C. Comstock
So eminent a physicist as Lord kelvin is quoted as follows: You can imagine particles of something, the thing whose motion constitutes light.
"The Approach to Philosophy"
Ralph Barton Perry
Although it lacked the refinements introduced by Lord kelvin it was swung in double-cradles, and had the thirty-two points painted upon a card.
"Christopher Columbus, Complete"
Filson Young