Hippolyte Fizeau

Hippolyte Fizeau studied at Collège Stanislas de Paris, Paris Medical Faculty and Collège de France. Training under Henri Victor Regnault and François Arago is recorded. The recorded working language is French. The field of work recorded is physics. Residence is recorded at Paris. Positions recorded include president of the French Academy of Sciences. Works named in the authority record are Doppler effect, Fizeau experiment, Fizeau interferometer and Fizeau–Foucault apparatus. Work by Hippolyte Fizeau is recorded in the collections of Art Institute of Chicago, The Nelson-Atkins Museum of Art, National Gallery of Canada, Metropolitan Museum of Art and Photography Collection. Distinctions recorded are Rumford Medal, Foreign Member of the Royal Society, 72 names on the Eiffel Tower and Knight of the Legion of Honour.

• Honorific Suffix — ForMemRS • Birth Name — Armand Hippolyte Louis Fizeau • Born — 23 September 1819 • Birthplace — Paris, Kingdom of France • Died — 18 September 1896 • Place of death — Venteuil, French Third Republic • Fields — Physics • Known for — * Discovering the Doppler redshift (1848) • Measuring the speed of light in air (1848–1849) • Performing the Fizeau experiment (1851) • Improving the induction coil (1853) • Awards — Rumford Medal (1866) ForMemRS (1875) Scientists

Fizeau was born in Paris to Louis and Beatrice Fizeau. He married into the de Jussieu botanical family. His earliest work was concerned with improvements in photographic processes. 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 Rømer in 1676. He used a beam of light reflected from a mirror 8633 meters away. The beam passed through the gaps between the teeth of a rapidly rotating wheel with 720 teeth. The speed of the wheel was increased until, at 12.6 rotations per second, the returning light hit the next tooth and could not be seen. At 25.2 rotations per second, the light was again visible. This gives a result of, which is within 5% of the correct value (299,792,458 meters per second). (See Fizeau's measurement of the speed of light in air.) Fizeau made the first suggestion in 1864 that the "speed of a light wave be used as a length standard". In 1850 he measured the relative speeds of light in air and water using a rotating mirror; however, Foucault independently achieved the same result seven weeks earlier. Fizeau was involved in the discovery of the Doppler effect, which is known in French as the Doppler–Fizeau effect. In 1853, Fizeau described the use of a capacitor (sometimes termed a "condenser") as a means to increase the efficiency of the induction coil. Later, he studied the thermal expansion of solids and applied the phenomenon of interference of light to the measurement of the dilatations of crystals. He became a member of the Académie des Sciences in 1860 and a member of the Bureau des Longitudes in 1878. He died in France at Venteuil on 18 September 1896. "Fizeau" is one of the 72 names inscribed on the frieze below the first platform of the Eiffel Tower, all of whom were French scientists, mathematicians, engineers, or industrialists from the hundred years before the tower's public opening for the 1889 World's Fair. Of the 72, Fizeau is the only one who was still alive when the tower was opened. The crater Fizeau on the far side of the Moon is named after him.

Hippolyte Fizeau was recorded at birth as Armand Hippolyte Louis Fizeau. Fizeau, Hippolyte Louis Fizeau and Armand-Hippolyte-Louis Fizeau. His recorded language was French. Other recorded relations include Adrien-Henri de Jussieu.

Hippolyte Fizeau worked in physics. Recorded position is president of the French Academy of Sciences. He belonged to Royal Society, Société Philomathique de Paris, French Academy of Sciences, Royal Swedish Academy of Sciences and Accademia Nazionale dei Lincei. He worked at Paris.

Hippolyte Fizeau is recorded with the occupation daguerreotypist. Recorded as having received Rumford Medal, Foreign Member of the Royal Society and 72 names on the Eiffel Tower. Formation and teaching. Fizeau studied at Collège Stanislas de Paris, Paris Medical Faculty and Collège de France. He trained under Henri Victor Regnault and François Arago.