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The mathematical physicist and engineer William Thomson, 1st Baron
Kelvin (1824 1904) is best known for devising the Kelvin scale of
absolute temperature and for his work on the first and second laws
of thermodynamics. The lectures in this collection demonstrate an
attempt by Baron Kelvin to formulate a physical model for the
existence of ether. This concept of a medium for light propagation
became prominent in the late nineteenth century, arising from the
combination of Maxwell's equations stating that light is an
electromagnetic wave with the demands of Newtonian physics that
light must move in a unique reference frame. First published in
1904, Kelvin's lectures describe the difficulties inherent in this
model. These problems with the concept of ether are credited for
inspiring Einstein to devise the theory of special relativity and
the photoelectric effect, both of which are central to modern
physics.
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