Niccolò Machiavelli: The Art of War and other writings of Niccolò Machiavelli: The Art of War (1521), one of only a few works of Machiavelli to be published during his lifetime, is a dialogue set in the Orti Oricellari, a garden in Florence where humanists gathered to discuss…

Raimondo Montecuccoli: His most important work, Dell’arte militare (1792; “The Military Art”), has been reprinted numerous times.

Luigi Galvani: Electrical nature of nerve impulse: …position in an anonymous book, Dell’uso e dell’attività dell’arco conduttore nella contrazione dei muscoli (“On the Use and Activity of the Conductive Arch in the Contraction of Muscles”), the supplement of which described muscular contraction without the need of any metal. He caused a muscle to contract by touching the…

Floyd Dell was a novelist and radical journalist whose fiction examined the changing mores in sex and politics among American bohemians before and after World War I. A precocious poet, Dell grew up in an impoverished family and left high school at age 16 to work in a factory. Moving to Chicago in

Michael Dell is an American entrepreneur, businessman, and author, known as the founder and CEO of Dell Inc., one of the world’s leading sellers of personal computers (PCs). In 2016 he became CEO of the newly formed parent company, Dell Technologies. What do you think? Explore the ProCon debate As

Italian literature: Prose: …scientific prose of Ristoro d’Arezzo’s Della composizione del mondo (1282; “On the Composition of the World”) and the simple narrative style of the Florentine collection of anecdotal tales distantly foreshadowing Boccaccio’s Decameron, Il novellino (written in the late 13th century, but not published until 1525, with the title Le ciento…

Della Falls, series of three cascades from Della Lake to the valley of Drinkwater Creek on Vancouver Island, B.C., Canada. They are located approximately 37 miles (60 km) northwest of the mill town of Port Alberni and about the same distance southwest of the town of Courtenay. With a nearly

education: Nonscholastic traditions: …century, also dedicated a treatise, Della famiglia (1435–44; “On the Family”), to methods of education. Alberti felt that the natural place for education was the home and not scholastic institutions. The language in which he wrote was Italian, education being in his view so important in social life that he…

Ferdinando Galiani: Galiani published two treatises, Della moneta (1750; “On Money”) and Dialogues sur le commerce des blés (1770; “Dialogues on the Grain Trade”), both of which display clarity of methodological presentation, despite his basic eclecticism. In the first work, he evolved a theory of value based on utility and scarcity;…

perspective: …his seminal Della pittura (1436; On Painting), Leon Battista Alberti codified, especially for painters, much of the practical work on the subject that had been carried out by earlier artists; he formulated, for example, the idea that “vision makes a triangle, and from this it is clear that a very…

Italy: Political thought and early attempts at reform: Muratori’s Della pubblica felicità (1749; “On Public Happiness”) reached Bourbon audiences in French and Spanish translations and was probably read in the Austrian Habsburg realms by Maria Theresa herself.

Andrea della Robbia was a Florentine sculptor who assumed control of the family workshop after his uncle’s death in 1482. Like Luca, Andrea della Robbia was apparently trained as a marble sculptor. His best-known works are 10 roundels of foundlings in swaddling clothes on the facade of Filippo

Andrea della Robbia was a Florentine sculptor who assumed control of the family workshop after his uncle’s death in 1482. Like Luca, Andrea della Robbia was apparently trained as a marble sculptor. His best-known works are 10 roundels of foundlings in swaddling clothes on the facade of Filippo

Giovanni della Robbia was a Florentine sculptor, son of Andrea della Robbia and grandnephew of Luca della Robbia who, upon the death of his father in 1525, assumed control of the family workshop. Giovanni’s early works, of which the most remarkable are a lavabo in the sacristy of Santa Maria

Giovanni della Robbia: Giovanni’s younger brother, Girolamo (1488–1566), was trained in Andrea’s studio and collaborated with his father and brother until he moved to France (c. 1527–28), where he was employed on the terra-cotta decoration of the demolished Château de Madrid. After the death of Francis I (1547), Girolamo returned to…

Luca della Robbia was a sculptor, one of the pioneers of Florentine Renaissance style, who was the founder of a family studio primarily associated with the production of works in enameled terra-cotta. Before developing the process with which his family name came to be associated, Luca apparently

Luca della Robbia was a sculptor, one of the pioneers of Florentine Renaissance style, who was the founder of a family studio primarily associated with the production of works in enameled terra-cotta. Before developing the process with which his family name came to be associated, Luca apparently

Alexander VI: …cardinal of the influential della Rovere family, threatened the pope with deposition and the convocation of a reform council. Politically isolated, Alexander sought assistance from the Turkish sovereign, Bayezid II. In the course of the pope’s meeting with King Charles in Rome in early 1495, however, he received the traditional…

Sixtus IV was the pope from 1471 to 1484 who effectively made the papacy an Italian principality. Becoming a Franciscan, he subsequently taught and was chosen minister general of his order in 1464. He was made cardinal in 1467 by Pope Paul II, whom he succeeded on Aug. 9, 1471. Neither a crusader

Lorenzo di Piero de’ Medici, duca di Urbino: …false pretenses its legitimate lord, Francesco Maria della Rovere. Francesco Maria, however, soon returned to Urbino, where he was welcomed by his subjects, and Lorenzo regained possession only by a protracted war, in which he was wounded. In 1519 he died, worn out by disease and excess. By his marriage…

Julius II was the greatest art patron of the papal line (reigned 1503–13) and one of the most powerful rulers of his age. Although he led military efforts to prevent French domination of Italy, Julius is most important for his close friendship with Michelangelo and for his patronage of other

della Scala family, noted family that ruled Verona during the late 13th and the 14th centuries. Although the family had been prominent in Verona since the 11th century, the founder of the ruling dynasty was Mastino I della Scala (d. 1277), who became podesta (chief magistrate) shortly after the

della Scala family: Bartolomeo’s brother Can Francesco, called Cangrande I (d. 1329), was the greatest figure of the family and protector of the exiled Dante. He first ruled Verona jointly with his brother Alboino, and together they gained the title of imperial vicar from the Holy Roman emperor Henry VII (1311). After Alboino’s…

della Scala family: …of the ruling dynasty was Mastino I della Scala (d. 1277), who became podesta (chief magistrate) shortly after the defeat and death (1259) of Ezzelino da Romano, tyrant of Verona. A new election in 1262 gave Mastino the added authoritative office of captain of the people. He was succeeded in…

della Scala family: …of the ruling dynasty was Mastino I della Scala (d. 1277), who became podesta (chief magistrate) shortly after the defeat and death (1259) of Ezzelino da Romano, tyrant of Verona. A new election in 1262 gave Mastino the added authoritative office of captain of the people. He was succeeded in…

Federico Della Valle was an Italian dramatist and poet, recognized in the 20th century as a major literary figure. Little is known of his life at the Savoy court in Turin and in Milan, where in 1628 three of his tragedies were published. The intensely lyrical La reina di Scozia (written in 1591;

Della-cruscan, any of the members of a late 18th-century school of English writers of pretentious, affected, rhetorically ornate poetry. The school was centred on Robert Merry, who belonged to the Italian Crusca Academy, and was satirized by William Gifford in The Baviad (1791) and The Maeviad

Paul Castellano: …causes of Castellano’s previous underboss, Aniello Dellacroce, who had headed a rival Gambino faction that disregarded Castellano’s ban on drug dealing. Dellacroce’s death may have emboldened his ambitious and violence-prone protégé John Gotti, who, according to an informant, witnessed Castellano’s murder from a parked car. Gotti, who took control of…

Washington Mystics: 96-metre) forward-guard Elena Delle Donne, winner of the league’s 2015 Most Valuable Player (MVP) award. In 2018 Delle Donne led the Mystics to the WNBA finals, where the team was swept by the Seattle Storm in three games. In 2019, however, the Mystics topped the league with…

Cesare, Count Balbo: Balbo’s most famous book, Delle speranze d’Italia (1844; “The Hopes of Italy”), showed the antirevolutionary nature of his patriotism and liberalism. He wrote that the independence of Italy from Austria was desirable, but Austria should be compensated with territory in the Balkans; that the interests of the papacy should…

Chicago Seven: …African American of the group; David Dellinger and Rennie Davis of the National Mobilization Committee to End the War in Vietnam (MOBE); and John Froines and Lee Weiner, who were alleged to have made stink bombs—were tried on charges of criminal conspiracy and incitement to riot.

Norman Dello Joio was an American composer in the neoclassical style who is particularly noted for his choral music. A member of a musical family, Dello Joio studied organ under his father. He attended the Institute of Musical Art and the Juilliard Graduate School and later studied composition with

Ron Dellums was an American politician who served as a U.S. Democratic representative from California for nearly three decades (1971–98). He was known for his outspoken criticism of U.S. involvement in the Vietnam War, his efforts to reduce U.S. military spending, and his championing of various

Ron Dellums was an American politician who served as a U.S. Democratic representative from California for nearly three decades (1971–98). He was known for his outspoken criticism of U.S. involvement in the Vietnam War, his efforts to reduce U.S. military spending, and his championing of various

flap-footed lizard: Some, such as Delma tincta, appear to jump off the ground when disturbed. This behaviour apparently confuses predators enough to allow the lizard to escape.

Marie Lloyd was the foremost English music-hall artiste of the late 19th century, who became well known in the London, or Cockney, low comedy then popular. She first appeared in 1885 at the Eagle Music Hall under the name Bella Delmare. Six weeks later she adopted her permanent stage name. T.S.

Delmarva Peninsula, portion of the Atlantic Coastal Plain of the United States, extending southward between the Chesapeake Bay (west) and the Delaware River, Delaware Bay, and Atlantic Ocean (east). Encompassing parts of the states of Delaware, Maryland, and Virginia (hence its name), the peninsula

Jacques Chaban-Delmas was a French politician, president of the National Assembly, and premier. Delmas was educated in political science and law and worked as a journalist before joining the army in 1938. As one of the early members of the Résistance (joined December 1940), he used Chaban as his

Elijah Delmedigo was a Jewish philosopher known for his Beḥinat ha-dat (“Investigation of Religion”), in which he criticized the Kabbala (esoteric Jewish mysticism). He also translated some of the commentaries of Averroës and wrote a Latin commentary on Aristotle’s Physics. He was a teacher of the

Delmenhorst, city, Lower Saxony Land (state), northwestern Germany. It lies on the Delme River, just west of Bremen. First mentioned in 1254, Delmenhorst developed around a moated castle belonging to a branch of the family of the dukes of Oldenburg, and it was chartered in 1371. Industrialization

Delmonico steak, thick steak prepared in a style made famous in the mid-19th century by Delmonico’s Restaurant in New York City, which is cited as the first (1827) official “restaurant” in the United States where individuals ordered off a menu instead of getting only what was prepared that day.

baked Alaska: …Ranhofer, the head chef at Delmonico’s Restaurant in New York, who called it “Alaska, Florida” to mark the combination of cold and heat. Ranhofer retained that title in a cookbook he published in 1893, and it was only with the publication in 1896 of Fannie Farmer’s Boston Cooking-School Cook Book…

Maxim Gorky: Last period: In Delo Artamonovykh (1925; The Artamonov Business), one of his best novels, he showed his continued interest in the rise and fall of prerevolutionary Russian capitalism. From 1925 until the end of his life, Gorky worked on the novel Zhizn Klima Samgina (“The Life of Klim Samgin”). Though he…

chemical bonding: Molecular orbitals of polyatomic species: That is, they are delocalized orbitals, and electrons that occupy them are delocalized over several atoms (here, as many as six atoms, as in the 1a orbital).

parietal cell, in biology, one of the cells that are the source of the hydrochloric acid and most of the water in the stomach juices. The cells are located in glands in the lining of the fundus, the part of the stomach that bulges above the entrance from the esophagus, and in the body, or principal

Alain Delon was a French film actor whose striking good looks helped make him one of the principal male stars of the French cinema in the 1960s and ’70s. Delon had an unsettled childhood and was a rebellious student. After a brief apprenticeship as a butcher, he enlisted as a French marine and in

Alain Delon was a French film actor whose striking good looks helped make him one of the principal male stars of the French cinema in the 1960s and ’70s. Delon had an unsettled childhood and was a rebellious student. After a brief apprenticeship as a butcher, he enlisted as a French marine and in

Thomas Deloney was a writer of ballads, pamphlets, and prose stories that form the earliest English popular fiction. By trade a silk weaver, probably of Norwich, Deloney wrote topical ballads and, through his pamphlets, took part in religious controversy. He was proscribed in London for alleged

royal poinciana, (Delonix regia), strikingly beautiful flowering tree of the pea family (Fabaceae). It is native to Madagascar, and it has been widely planted in frost-free regions for its large scarlet to orange flowers and its shade. It is a rapid grower, attaining a height of 6 to 12 metres (20

DeLorean DMC-12, an innovative sports car, produced from 1981 to 1983, with gull-wing doors and stainless-steel body panels. It should have been the commercial coup of the century, leading to massive worldwide sales, but interest waned sharply in just a couple of years. The cause for the failure of

DeLorean DMC-12: …the successor, he founded the DeLorean Motor Company in 1975 and, basing his design on a Porsche that never went into production, developed the futuristic DMC-12 for the U.S. market.

DeLorean DMC-12: Although skilled entrepreneur John Zachary DeLorean had honed his engineering and management skills in the cut-throat world of American auto manufacture, notably when developing the iconic Pontiac Firebird and GTO “muscle cars.” When his employer, General Motors, showed reluctance to finance the successor, he founded the DeLorean Motor…

Ella Cara Deloria was a Dakota Sioux scholar, ethnographer, writer, and translator who was a critically important recorder of Sioux culture and languages at a time when the traditional culture was in danger of being lost. Both Deloria’s parents were of mixed Euro-American and Yankton Sioux descent.

Marion Delorme was a celebrated French courtesan. She was the daughter of Jean de Lon, Sieur de Lorme, and became the lover of the poet and freethinker Jacques Vallée, Sieur des Barreaux. She soon left him, however, for Louis XIII’s young favourite, the Marquis de Cinq-Mars, whom she almost

Philibert Delorme was one of the great Renaissance architects of the 16th century and, possibly, the first French architect to possess some measure of the universal outlook of the Italian masters but without merely imitating them. Mindful that French architectural requirements differed from

Jacques Delors was a French statesman who served as president of the European Commission, the executive body of the European Community (EC; ultimately succeeded by the European Union [EU]), from 1985 to 1995. The son of a courier at the Banque de France, Delors himself joined the bank in 1945,

Jacques Delors was a French statesman who served as president of the European Commission, the executive body of the European Community (EC; ultimately succeeded by the European Union [EU]), from 1985 to 1995. The son of a courier at the Banque de France, Delors himself joined the bank in 1945,

Delos, island, one of the smallest of the Cyclades (Modern Greek: Kykládes), Greece, an ancient centre of religious, political, and commercial life in the Aegean Sea. Now largely uninhabited, it is a rugged granite mass about 1.3 square miles (3.4 square km) in area. Also called Lesser Delos, it

Delphi, ancient town and seat of the most important Greek temple and oracle of Apollo. It lay in the territory of Phocis on the steep lower slope of Mount Parnassus, about 6 miles (10 km) from the Gulf of Corinth. Delphi is now a major archaeological site with well-preserved ruins. It was

amphictyony: The most important was the Amphictyonic League (Delphic Amphictyony). Originally composed of 12 tribes dwelling around Thermopylae, the league was centred first on the shrine of Demeter and later became associated with the Temple of Apollo at Delphi. Member states sent two kinds of deputies (pylagorai and hieromnēmones) to a…

Delphic oracle, most famous ancient oracle, believed to deliver prophecies from the Greek god Apollo. She was based in his temple at Delphi, located on the slopes of Mt. Parnassus above the Corinthian Gulf. The oracle, who at first was called Pytho (the original name of Delphi) and later Pythia,

Apollo: …most curious was the octennial Delphic Stepterion, in which a boy reenacted the slaying of the Python and was temporarily banished to the Vale of Tempe.

Angelos Sikelianós: …Greek Easter”), culminating in the Delphikós lógos (1927; “Delphic Utterance”). In the last, Greek tradition and the national historic and religious symbols are given a mystic turn and a universal significance.

Delphin Classics, an edition of the Latin classics prepared in the reign of Louis XIV of France. The series was supervised by Pierre-Daniel Huet from 1670 to 1680, when he was working with Jacques Bossuet, tutor to Louis XIV’s son, the dauphin Louis. The name of the series was derived from a Latin

beluga, (Delphinapterus leucas), a small, toothed whale found mainly in the coastal waters of the Arctic Ocean and adjacent seas but also in rivers and deep offshore waters. It is an extremely vocal cetacean and thus has also been referred to as the “canary of the sea.” This whale can also

Germaine de Staël: Literary theories: Her two novels, Delphine (1802) and Corinne (1807), to some extent illustrate her literary theories, the former being strongly sociological in outlook, while the latter shows the clash between Nordic and southern mentalities.

dolphin: Paleontology and classification: Family Delphinidae (oceanic, or marine, dolphins)37 species in 17 genera found worldwide, some of which occasionally venture into fresh water. Genus Lagenorhynchus (white-sided and white-beaked dolphins)6 species found in subpolar to temperate waters of the Northern Hemisphere and polar to temperate waters of the Southern Hemisphere.

larkspur, (genus Delphinium), genus of about 365 species of herbaceous plants of the buttercup family (Ranunculaceae), many of which are grown for the floral industry and as ornamentals for their showy flower stalks. The plants are found throughout the Northern Hemisphere and in certain montane

larkspur: …genus Consolida) include the common rocket larkspur (Delphinium ajacis or C. ajacis) and its varieties, which grow up to 60 cm (2 feet) tall and have bright blue, pink, or white flowers on branching stalks. Perennial larkspurs—which tend toward blue flowers but vary to pink, white, red, and yellow—include a…

Delphinus, small constellation in the northern sky at about 21 hours right ascension and 10° north in declination. The brightest star in Delphinus is Rotanev, with a magnitude of 3.63. The four brightest stars form a diamond-shaped asterism called “Job’s Coffin.” In Greek mythology there are two

dolphin: …widely recognized species are the common and bottlenose dolphins (Delphinus delphis and Tursiops truncatus, respectively). The bottlenose, characterized by a “built-in smile” formed by the curvature of its mouth, has become a familiar performer in oceanariums. It has also become the subject of scientific studies because of its intelligence and…

Richard Linklater: First films: Dazed and Confused and Before Sunrise: …which two strangers (played by Julie Delpy and Ethan Hawke) meet on a train in Europe and spend one night together in Vienna discussing love and the vagaries of human nature. Linklater then directed a pair of forgettable studio productions (SubUrbia [1996] and The Newton Boys [1998]) before returning to…

Delray Beach, city, Palm Beach county, southeastern Florida, U.S. It lies along the Atlantic Ocean about 20 miles (30 km) south of West Palm Beach. Settlers from Michigan arrived in 1894 and began farming. Soon after, Japanese settlers arrived and founded the Yamato Colony, where they grew

Delray Beach, city, Palm Beach county, southeastern Florida, U.S. It lies along the Atlantic Ocean about 20 miles (30 km) south of West Palm Beach. Settlers from Michigan arrived in 1894 and began farming. Soon after, Japanese settlers arrived and founded the Yamato Colony, where they grew

major industrial polymers: Polyacetal: Also called polyoxymethylene (POM) or simply acetal, polyacetal has the simplest structure of all the polyethers. It is manufactured in a solution process by anionic or cationic chain-growth polymerization of formaldehyde (H2C=O), a reaction analogous to vinyl polymerization. By itself, the polymer is unstable…

acting: Diderot’s Paradox of Acting: …of the 19th-century French teacher François Delsarte, whose influence was widespread not only in France but also in the United States. Delsarte became dissatisfied with routine acting techniques. He observed their mechanical and stultifying character and realized that under the stress of natural instinct or emotion, the body assumes appropriate…

Delémont, capital of Jura canton, northwestern Switzerland, situated in a wide valley at the confluence of the Sorne and Birse rivers. First mentioned in historical records in 727, Delémont was annexed by the prince-bishops of Basel in the 11th century for use as a summer residence. Seized by

Jura Mountains: … and Mount Tendre; but the Delsberg Valley and the north-facing corridor of the Ergolz River (Liestal) receive less than 40 inches (1,000 mm). The climate is of the maritime-continental transitional type: it is rawer on the Jura heights, milder in the protected valleys and on the south-facing slopes. Pools of…

comet: The modern era: …was aided by Belgian astronomer Armand Delsemme, who carefully calculated the rate of water ice sublimation as a function of a comet’s distance from the Sun.

Delta, district municipality, southwestern British Columbia, Canada. It is situated in the southern Vancouver metropolitan area, between the Fraser River delta and Boundary Bay (an arm of the Strait of Georgia). Though its northern section is primarily residential, much of its area is devoted to

Delta, series of American launch vehicles, originally based on the Thor intermediate-range ballistic missile, that have been in service since the early 1960s. The Delta launch vehicles have been built by the McDonnell Douglas Corporation and, since 1997, by the Boeing Company. The first version,

submarine: Strategic submarines: …followed a decade later by Delta-class vessels fitted with 16 SS-N-18 missiles. Each SS-N-18 had a range of 3,500 nautical miles (6,500 km). In 1982 the Soviet Union began to deploy its Typhoon class; at an estimated surface of 25,000 tons and a length of 170 metres (560 feet), these…

Delta, state, southern Nigeria. It is bounded by Edo state to the north, Anambra state to the east, Rivers state to the southeast, Bayelsa state to the south, the Bight of Benin of the Atlantic Ocean to the west, and Ondo state to the northwest. On the east and south the state is bounded by the

cell: The process of differentiation: …another cell surface molecule called Delta that can bind to and activate Notch on adjacent cells. Activation of Notch initiates a cascade of intracellular events that results in suppression of Delta production and suppression of neuronal differentiation. This means that the neuroepithelium generates only a few cells with high expression…

Delta, city, Millard county, west-central Utah, U.S. Delta is one of the few Utah towns to have been founded in the 20th century with little involvement from the Mormon church, which tightly controlled settlement in the region. Originally an agricultural cooperative called Melville, founded in

Mumford & Sons: Delta (2018) continued in that vein but was more experimental.

delta, low-lying plain that is composed of stream-borne sediments deposited by a river at its mouth. A brief treatment of deltas follows. For full treatment, see river: Deltas. One of the first texts to describe deltas was History, written during the 5th century bce by Greek historian Herodotus. In

hepatitis: Hepatitis D: Infection with hepatitis D virus (HDV), also called the delta agent, can occur only in association with HBV infection, because HDV requires HBV to replicate. Infection with HDV may occur at the same time infection with HBV occurs, or HDV may infect a person already infected with…

Delta Air Lines, Inc., American airline incorporated on Dec. 31, 1930, as Delta Air Corporation, which adopted the current name in 1945. Engaged initially in agricultural dusting operations in the southern United States and in Mexico, it progressed, especially after 1934, to transporting passengers

Delta Air Lines, Inc., American airline incorporated on Dec. 31, 1930, as Delta Air Corporation, which adopted the current name in 1945. Engaged initially in agricultural dusting operations in the southern United States and in Mexico, it progressed, especially after 1934, to transporting passengers

Delta Amacuro, estado (state), northeastern Venezuela. It is bounded by the Atlantic Ocean on the northeast, Guyana on the southeast, and the Venezuelan states of Bolívar on the south and Monagas on the west. The state consists of one of the largest swampy deltas in the world, through which the 26

Go Down, Moses: In “Delta Autumn,” Ike, at age 79, is forced to confront his role in perpetuating the exploitation of his own black relatives. In the final story, “Go Down, Moses,” Faulkner focuses not on inner family struggles but on the entire community.

Mississippi Delta blues, regional style of early 20th-century American folk music, centred in the Delta region of northwestern Mississippi. The pioneers of the style played a key role in developing the market for traditional blues recordings in the 1920s and ’30s, while the subsequent generation of

Clarksdale: …Hooker and Muddy Waters; the Delta Blues Museum is located there, and the Sunflower River Blues Festival is held in the city each August. Other annual events include the Delta Jubilee in June and the Tennessee Williams Festival in October. Coahoma Community College opened in 1949 in Clarksdale. Inc. 1882.…

chemical bonding: Metal cluster compounds: The new feature is the δ bond, which is formed by the face-to-face overlap of two parallel d orbitals and has a distinctly different symmetry with respect to the internuclear axis than the other two types of bond. A quadruple bond therefore consists of a σ bond, two π bonds,…

human digestive system: Production and secretion of peptides: For example, delta (D) cells, which produce a hormone known as somatostatin, are dispersed throughout the whole gastrointestinal tract. Somatostatin has inhibiting effects on the production of acid in the stomach, the motor activity of the intestine, and the release of digestive enzymes from the pancreas. These…

Delta Cephei, prototype star of the class of Cepheid variables, in the constellation Cepheus. Its apparent visual magnitude at minimum is 4.34 and at maximum 3.51, changing in a regular cycle of about five days and nine hours. Its variations in brightness were discovered in 1784 by the English

electric generator: Phases: …c′ to a—to form a delta connection. The output can then be transmitted using only three conductors connected to the three junction points. Other advantages of the three-phase system will become evident in the discussion of electric motors below.

military aircraft: Supersonic flight: Convair F-102 Delta Dagger, an all-weather interceptor that was the first operational “pure” delta fighter without a separate horizontal stabilizer. Other aircraft included the Grumman F11F Tigercat, the first supersonic carrier-based fighter; the North American F-100 Super Sabre; the Dassault Mystère B-2; the Saab 35, with…

Delta Force, tier-one special missions unit within the U.S. armed forces. It has also been referred to as the Combat Applications Group (CAG), Army Compartmented Elements (ACE), Task Force Green, and simply “the Unit,” as well as a host of cover names. Delta Force is primarily devoted to