Testing Needles
Small strips of steel with gold points, usually running from 4k. to 20k. inclusive, and used in conjunction with a touchstone for determining the quality of gold. The gold to be tested is first rubbed upon the touchstone, and the needle which most closely approximates to it in quality, in the judgment of the operator, is also rubbed upon the stone. The two marks are then treated with nitric acid and the difference in color indicates the difference in quality of the two marks. See Touchstone.
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Tetard
JEAN (tuh-tä'), a French philosophical and polemical writer; born in Longvic, Burgundy, in 1770. Among his writings writings are: "Moral Essay on Man in His Relation to God" (1818); "Against Obscurantism and Jesuitism" (1826); "Indelible and Historic Character of Jesuitism and Doctrinism" (1832). He died in Paris in 1841. TÊTE-DU-PONT, in fortifications, a redan or lunette resting its flanks on the bank of a river and inclosing the end of a bridge for the purpose of protecting it from an assault.
JEAN (tuh-tä'), a French philosophical and polemical writer; born in Longvic, Burgundy, in 1770. Among his writings are: "Moral Essay on Man in His Relation to God" (1818); "Against Obscurantism and Jesuitism" (1826); "Indelible and Historic Character of Jesuitism and Doctrinism" (1832). He died in Paris in 1841. TÊTE-DU-PONT, in fortifications, a redan or lunette resting its flanks on the bank of a river and inclosing the end of a bridge for the purpose of protecting it from an assault.
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Tethys
in Greek mythology, the greatest of the sea deities, wife of Oceanus, daughter of Uranus and Terra, and mother of the chief rivers of the universe, Nile, Peneus, Simois, Scamander, etc., and about 3,000 daughters called Oceanides. The name Tethys is said to signify nurse. In astronomy, a Satellite of Saturn. Its mean distance from the center of Saturn is 188,000 miles; its periodic time, 1 day, 21 hours, 18 minutes, 25.7 seconds. In zoology a genus of Tritoniade, with one species, from the Mediterranean, animal elliptical, depressed; head covered by a broadly expanded fringed disk with two conical tentacles; stomach simple. It attains a foot in length, and feeds on other mollusks and on small crustacea.
in Greek mythology, the greatest of the sea deities, wife of Oceanus, daughter of Uranus and Terra, and mother of the chief rivers of the universe, Nile, Peneus, Simois, Scamander, etc., and about 3,000 daughters called Oceanides. The name Tethys is said to signify nurse. In astronomy, a Satellite of Saturn. Its mean distance from the center of Saturn is 188,000 miles; its periodic time, 1 day, 21 hours, 18 minutes, 25.7 seconds. In zoölogy a genus of Tritoniade, with one species, from the Mediterranean, animal elliptical, depressed; head covered by a broadly expanded fringed disk with two conical tentacles; stomach simple. It attains a foot in length, and feeds on other mollusks and on small crustacea.
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Tetracera
in botany, a genus of Delimeæ, owing its scientific name to the fact that its four capsules are recurved like horns. Shrubs or small trees, often , ferten climbing with rubernatemalalees er-nerved, naked leaves, often rough above, and panicled or racemose inflorescence. A decoction of T. breyniana and T. oblongata is given in Brazil in swelling of the legs. T. tigarea is diaphoretic, diuretic, and antisyphilitic. TETRACHORDON. in music, an instrument similar in appearance to a cottage pianoforte, and like it played by finger-board, but the tone, instead of being produced by striking, is obtained by means of a cylinder of india-rubber charged with resin, kept in motion by a pedal, variety of tone being gained by the depth of pressure on the keys by the fingers. It is called the tetrachordon from an idea that its sounds are similar to those produced by a string quartet. The instrument is constructed also with selfacting machinery. Milton used the word as the title of one of his treatises on marriage, occasioned by his disagreement with his wife, Mary Powell. He explained the word in the sub-title: "Expositions upon the Four Chief Places of Scripture which treat of Marriage."
in botany, a genus of Delimeæ, owing its scientific name to the fact that its four capsules are recurved like horns. Shrubs or small trees, often climbing, with alternate, stalked, feather - nerved. naked leaves, often rough D TEUTSCH
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Tetradymite
rhombohedral a mineral found sometimes in crystals, but more frequently granular, massive, or foliated, often with auriferous ores; luster, bright metallic; color, pale steel-gray; in thin laminæ, flexible. Composition: Somewhat variable, but consists principally of bismuth and tellurium. Dana divides as follows: (a) Free from sulphur, with formula Bi2Te3; (b) Sulphurous, with formula, Biz (3/Te+1/S)3, and (c) Seleniferous. Also the same as joseite and wehrlite.
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Tetragoniacee
a small order of plants, alliance Ficoidales. No petals, and several consolidated carpels. They are succulent, leaved, herbaceous plants, or small shrubs, chiefly natives of New Zealand.
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Tetragonurus
in ichthyology, a genus of Atherinidæ, with a single species. Body sub-elongate, scales strongly the second. It is a rare fish, more frequently met with in the Mediterranean than in the Atlantic. Nothing is known of its habits, but as, when young, it accompanies the Meduse, it must be regarded as a pelagic form. At a later period of its existence it probably descends to greater depths, coming to the surface only at night. It attains a length of about 18 inches.
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Tetragraptus
in palæontology, a genus of Graptolitidæ from the Skiddaw and Quebec groups (Lower Silurian). four simple The polypary consists mono-prionidian branches, springing from central non-celluliferous connecting a process, which bifurcates at each end. The celluliferous branches do not subdivide, and the base may be enveloped horny disk. in a peculiar
in palæontology, a genus of Graptolitidæ from the Skiddaw and Quebec groups ( Lower Silurian). The polypary consists of four simple mono central - prionidian non - branches celluliferous, springing connecting from a cach end. 322 TEXAS a The town was incorporated by Elizabeth in 1574.
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Tetragynia
an order of plants in Linnæus' artificial system. It consisted of plants having four pistils. The classes Tetrandria, Pentandria, Hexandria, Heptandria, Octandria, and Polyandria, have each an order Tetragynia.
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