1819, Sep 231896, Sep 18
a French physicist, best known for measuring the speed of light in the namesake Fizeau experiment. Following suggestions by François Arago, Léon Foucault and Fizeau collaborated in a series of investigations on the interference of light and heat. In 1848, he predicted the redshifting of electromagnetic waves. In 1849, Fizeau calculated a value for the speed of light to a better precision than the previous value determined by Ole Christensen Romer in 1676. He used a beam of light reflected from a mirror 8 kilometers away. The beam passed through the gaps between teeth of a rapidly rotating wheel. The speed of the wheel was increased until the returning light passed through the next gap and could be seen.
 Gallery (1)

 Timeline (1)
04/02/1845-Hippolyte Fizeau and Jean Bernard Leon Foucault take first photo of Sun
Colonial Sense is an advocate for global consumer privacy rights, protection and security.
All material on this website © copyright 2009-23 by Colonial Sense, except where otherwise indicated.