ARMAND HIPPOLYTE See also:

• LOUIS
• LOUIS (804–876)
• LOUIS (893–911)
• LOUIS, JOSEPH DOMINIQUE, BARON (1755-1837)
• LOUIS, or LEWIS (from the Frankish Chlodowich, Chlodwig, Latinized as Chlodowius, Lodhuwicus, Lodhuvicus, whence-in the Strassburg oath of 842-0. Fr. Lodhuwigs, then Chlovis, Loys and later Louis, whence Span. Luiz and—through the Angevin kings—Hungarian

LOUIS See also:

• ARMAND HIPPOLYTE LOUIS FIZEAU (1819–1896)

FIZEAU (1819–1896)  , See also:

• FRENCH
• FRENCH, DANIEL CHESTER (1850– )
• FRENCH, NICHOLAS (1604-1678)

French physicist, was See also:

• BORN, IGNAZ, EDLER VON (1742–1791)

born at See also:

• PARIS
• PARIS (also called ALEXANDROS)
• PARIS, ALEXIS PAULIN (1800-x881)
• PARIS, BRUNO PAULIN GASTON (1839-1903)
• PARIS, FRANCOIS DE (169o-1727)
• PARIS, LOUIS PHILIPPE ALBERT
• PARIS, TREATIES OF (1814-1815)

Paris on the 23rd of See also:

• SEPTEMBER (Lat. septem, seven)

September 1819 . His earliest See also:

• WORK

work was concerned with improvements in photo-graphic processes; and then, in association with J . B . L . See also:

• FOUCAULT, JEAN BERNARD LEON (1819—1868)

Foucault, he engaged in a See also:

• SERIES (a Latin word from serere, to join)

series of investigations on the interference of See also:

• LIGHT

light and See also:

• HEAT (0. E. haktu, which like " hot," Old Eng. hat, is from the Teutonic type haita, hit, to be hot; cf. Ger. hitze, heiss; Dutch, hitte, heet, &c.)

heat . In 1849 he published the first results obtained by his method for determining the See also:

• SPEED, JOHN (1552–1629)

speed of See also:

• PROPAGATION

propagation of light (see LIGHT), and in 185o with E . Gounelle measured the velocity of See also:

• ELECTRICITY

electricity . In 1853 he described the employment of the See also:

• CON

con-denser as a means for increasing the efficiency of the See also:

• INDUCTION (from Lat. inducere, to lead into; cf. Gr. ilrayu yli)

induction-coil . Subsequently he studied the expansion of solids by heat, and applied the phenomena of interference of light to the measurement of the dilatations of crystals . He died at Venteuil on the 18th of September 1896 . He became a member of the French See also:

• ACADEMY, GREEK
• ACADEMY, ROYAL

Academy in 186o and of the See also:

• BUREAU (a Fr. word from burel or bureau, a coarse cloth used for coverings)

Bureau See also:

• DES

des Longitudes in 1878 .