Door
a wooden or metal, or partly wood and partly metal frame, constructed so as to open and shut on hinges and close the entrance to a building, rooms, etc. The doors of ancient Egypt and contemporary nations swung upon vertical pintles which projected from the top and bottom of the door into sockets in the lintel and threshold respectively. The commonest form of door had the pintle in the middle of the width; so that, as it opened, a way was afforded on each side of it for ingress or egress. Double-margin doors are made in imitation of folding-doors, the middle style being made double with an intervening bead. Sliding-doors are an improvement on folding; they slip into grooves in the partition. A proper-ledged door is one made of boards placed side by side with battens called ledges at the back. With a diagonal piece at the back, in addition, it is said to be framed and ledged.
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Doorga
the appellation of a giant slain by Doorga, to whom, consequently, his name was transferred. In Hindu mythology the principal wife as well as the mother of Siva, one of the gods belonging to the Hindu triad. The name Doorga is her appropriate appellation in Bengal, but in southern and western India she is generally Purwutee, or Parvati. Her great exploit was slaying the giant Doorga.
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Doornboom
a common tree in the wastes of south Africa. The mame given to it by the Dutch colonists and the botanical specific name (Acacia horrida) are due to the number and sharpness of its spines. It seldom much exceeds 30 feet in height, but its timber is hard and tough, and is much used for house-carpentry. DOPPLERITE (named after B. Doppler, the first to bring it to notice), an amorphous mineral occurring in elastic or partly jelly-like masses found in peat-years of age, comic sketches to the "Jourbeds in Styria and Switzerland. When fresh it is brownish-black, with a dull brown streak and greasy subvitreous luster, insoluble in alcohol or ether. Dopplerite is also the name of a variety of hircite, grayish, earthy, and plastic in the fingers when fresh.
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Doppler Effect
the change in the frequency and length of light or sound ing body on account of the latter's approach or recession. When a body which is emitting such waves is at the same time approaching the observer, the number of vibrations reaching the latter in a unit of time is of course increased; or, in other words, the wave-lengths are diminished, thus altering the color of any light emitted or raising the pitch of any sound. A familiar example of the Doppler effect is the rise of pitch in a locomotive whistle, followed by its fall, as it passes a car window. Doppler's Principle has long been used in astronomy, in connection with the spectroscope, to determine the radial velocity of stars: - that is, the speed with which stars are moving toward or away from the solar system. It has also been used to prove and measure the rotation of the sun and various planets, as well as to measure the orbit of the earth. In the field of sound, the Doppler effect has recently been utilized in a signaling device invented by Mr. Anders Bull, which indicates to receivers the direction of the signal by means of
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Dor
or MONT DORE (often written less properly Mont d'Or), a chain of mountains in France comprised in the great group of the Auvergne Mountains in the department of Puy-de-Dôme. They are clearly of volcanic formation, and rise in the Puy-de-Sancy, which is the highest peak of central France, to the height of 6,190 feet.
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Dor
a negro people of central Africa, also called Bongo, between 6° and 8° N. lat., and bordering on the Dinka and Niam-Niam stocks.
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Dor
or DORR, a species of beetle, belonging to the family Geotrupidæ, or It is of a glossy violet, earthborers. black, or deep greenish-black. The club of the antennæ is yellowish, the elytra smooth, but slightly punctuated, as is the thorax. It may often be seen flying about in the summer evenings. Its size and weight render it very unwieldy on the wing. The female lays its eggs in patches of cow-dung. It is about an inch long. long. It is also also called dor or dorr-beetle, dor-fly, and buzzard-fly.
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Dorchester
a municipal borough, the county town of Dorsetshire, England. In March, 1645, Cromwell held the town as his headquarters with 4,000 men, and in 1685 Judge Jeffreys held his "bloody assize" here, when 292 received sentence of death as being implicated in Monmouth's rebellion. Pop. about 10,000.
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Dordogne
a department of France which includes the greater part of the ancient province of Périgord, and small portions of Limousin, Angoumois, and Saintonge. Area, 3,546 square miles. The chief minerals are iron, which is abundant, slate, limestone, marble, and other stone. Mining, iron manufacture, etc., are carried on to a considerable extent, and there are a number of vineyards. The climate is mild but somewhat changeable. Pop. about 440,000. The river DORDOGNE, principal river of the department, rises on the flanks of the Puy-de-Sancy, flows W. S. W., and after a course of 290 miles unites with the Garonne in forming the Gironde. DORDRECHT. See DORT. DORÉ (dō-rā), PAUL GUSTAVE, a French draughtsman and painter; born in Strassburg, Jan. 6, 1833. He studied at Paris, contributing, when only 16 nal pour Rire." He distinguished himself greatly as an illustrator of books. His illustrations of "Rabelais," of Perrault's "Tales," Sue's "Wandering Jew," Dante's "Divina Commedia," and Cervantes's "Don Quixote," displayed a great fertility of invention. His illustrations of the Bible, of Ariosto's "Orlando, Furioso," and Milton's "Paradise Lost," are also of high excellence. As a painter he had grandeur of conception and a bold expressive style. Among his chief works are "Christ leaving the Prætorium," "Paolo and Francesca di Rimini," "The Flight into Egypt," etc. In later years Doré also won fame as a sculptor. He died Jan. 23, 1883.
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Dore Agrippa
a French scholar; born near Pons, in Saintonge, Feb. 8, 1552, of a noble family, he early entered the military profession, and distinguished himself by his services to the Huguenot cause. He was subsequently rewarded by Henry IV., who made him Vice-Admiral of Guienne and Brittany. His severe and inflexible character frequently embroiled him with the court; and after Henry's assassination (1610), he betook himself to Geneva, where he spent the remainder of his life in literary studies. His best known work is a "Universal History." He died April 29, 1630.
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