Chattanooga, Battle Of

(November 23–25, 1863), in the American Civil War, a decisive engagement fought at Chattanooga on the Tennessee River in late November 1863, which contributed significantly to victory for the North. Chattanooga had strategic importance as a vital railroad junction for the Confederacy. In September 1863 a Federal army led by General William S. Rosecrans was besieged there by a Southern

Amorphous Solid

On amorphous solids in particular, a lucid introductory text accessible to a nontechnical reader is Richard Zallen, The Physics of Amorphous Solids (1983), with coverage of structural models for the various classes of amorphous solids as well as percolation theory, a modern paradigm for disordered systems. A classic advanced work is N.F. Mott and E.A. Davis, Electronic Processes in Non-crystalline Materials, 2nd ed. (1979), which features many of the theoretical contributions of Nobel Laureate coauthor Mott. A text providing a thorough treatment of oxide glasses is J. Zarzycki, Glasses and the Vitreous State (1991; originally published in French, 1982). A reference work with wide coverage of recent research topics, including detailed treatment of chalcogenide glasses, is S.R. Elliott, Physics of Amorphous Materials, 2nd ed. (1990). A comprehensive collection of detailed reviews is contained in R.W. Cahn, P. Haassen, and E.J. Kramer (eds.), Materials Science and Technology, vol. 6, Glasses and Amorphous Materials, ed. by J. Zarzycki (1991), including coverage of glass technology, formation, and structure, oxide glasses, chalcogenide glasses, metallic glasses, polymeric glasses, and the optical, electric, and mechanical properties of glasses. Amorphous silicon is treated in detail in another work, R.A. Street, Hydrogenated Amorphous Silicon (1991).

Ear Disease, Ménière's disease

Ménière's disease, also called endolymphatic hydrops, is a fairly common disorder of the labyrinth of the inner ear that affects both the vestibular nerve, with resultant attacks of vertigo, and the auditory nerve, with impairment of hearing. It was first described in 1861 by a French physician, Prosper Ménière. It is now known that the symptoms are caused by an excess of

Botsaris, Markos

Botsaris' early years were spent in the struggle between the Souliots of southern Epirus and Ali Pasa, who had made himself ruler of Ioánnina (Janina) in Epirus in 1788. After Ali Pasa succeeded in capturing the Souliot strongholds in 1803, Botsaris and most of his surviving

Rydberg Constant

(symbol R¥), fundamental constant of atomic physics that appears in the formulas developed (1890) by the Swedish physicist J. R. Rydberg, describing the wavelengths or frequencies of light in various series of related spectral lines, such as those emitted by hydrogen atoms. The value of this constant is based on the premise that the nucleus of the atom emitting light is exceedingly

Segovia Aqueduct

Byname  El Puente (Spanish: “The Bridge”),  water-conveyance structure built under the Roman emperor Trajan (reigned AD 98–117) and still in use; it carries water 10 miles (16 km) from the Frío River to the city of Segovia, Spain. One of the best-preserved Roman engineering works, it was built of some 24,000 dark-coloured Guadarrama granite blocks without the use of mortar. The aboveground portion is 2,388 feet (728 metres) long and consists of some

Ramillies, Battle Of

The battle was fought at the village of Ramillies, 13 miles north of Namur (in modern Belgium), between a 62,000-man Allied army under Marlborough and a 60,000-man

Alkaline-earth Metal

Prior to the 19th century, substances that were nonmetallic, insoluble in water, and unchanged by fire were known as earths. Those earths, like lime, that resembled the alkalies (soda ash and

Orage, Alfred Richard

Orage became an elementary school teacher at Leeds, Yorkshire, in 1893, lectured on theosophy, and in 1900 helped found the avant-garde Leeds Arts Club. He moved to London in 1906 and became joint editor in 1907 of The New Age, a periodical of which from 1909 on he was the sole editor and dominant spirit. The New