diamantinet (diamantin)

[ For in the Heav'ns, aboue all reach of ours, He dwels immur'd in diamantine Towers. 1592 The space between the earth and the moon, according to Ptolemy, is seventeen times the diameter of the earth. Raleigh, Apparent diameter of a heavenly body. See appar ent. Biparietal diameter. See biparietal.-Conjugate diameters of a conic. See conjugate. Ideal diameter, an ideal chord through the center. See ideal. In di ametert, diametrically. He fals off again warping and warping till he come to contradict himselfe in diameter. Milton , Apology for Smectymnuus. Tactical diameter, in naval tactics, the space occupied by a ship in turning 180° from a straight course; the diameter of the circle in which the ship turns after her motion has become uniform is called her final diameter. Tactical diameters vary according to the angle at which the rudder is held. diametral (di-am'e-tral), a. and n. [F. diamé tral = Sp. Pg. diametral = It. diametrale - D. diametraal = Dan. Sw. diametral, So diametral One to another, and so much opposed, As if I can but hold them all together,... I shall have just occasion to believe My wit is magisterial. B. Jonson, Magnet ick Lady, i. 1. This band shall occupy a diametral position along the whole height of the ve el, and thus receive the friction the same as the walls of the tube do. Jour. Franklin Inst., CXXV. 41. Diametral circle, a circle doubly tangential to a Cartes i an oval on its axis of symmetry. - Diametral number. (a) A number equal to (1+2)+(1-12)n, where n is any integer. These numbers are 1, 3, 7, 17, 41, 99, etc. (b) A number resolvable into two factors the sum of whose squares is a square. Thus, 120 is such a number, because 120 = 8 x 15 and 82 + 152 = 172.- Diametral planes, in crystal., those planes which are parallel to the vertical and one of the lateral axes; a prism formed by such planes is called a diametral prism. II. n. A diameter; a diagonal. Natural crystals are found in a great variety of forms belonging to the isometric system. The crystalline planes of the diamond have this peculiarity, that they are frequently more or le convex, instead of being flat, as those of crystals usually are. The range of color of the diamond is extensive, but hues of light yellow, or straw. color, and brown are of most common occurrence. Diamonds of a decided color, such as green, blue, or even red, are found, but they are extremely rare; only one deep-red diamond is known. A diamond is of the first water when it is without flaw or tint of any kind. The value of the gem increases in an increasing ratio with its weight up to a moderate size; beyond that there is no fixed value. A first-water diamond of one carat being considered worth $100, one of two carats would be held at $300, and one of ten at $11,000. The most desirable form in which the diamond may be cut is called the brilliant. (See cuts under brilliant.) Diamonds formerly came chiefly from India, and later from Brazil; the present principal source of supply is southern Africa, where they are found a ociated with a peculiar rock of unequivocal volcanic origin. In all other diamantiferous regions diamonds have been found only in the surface detrital material (gravel and sand), or else, rarely, in rock of fragmental origin. See bort. Thei ben so harde, that no man may pollysche hem and men clepen hem Dyamandes in that Contree, and Hamese in another Contree. Mandeville, Travels, p. 157. Give me the ring of mine you had at dinner; Or, for my diamond , the chain you prom is'd. Shak., C. of E., iv. 3. 3. A geometrical figure bounded by four equal straight lines forming two acute and two obtuse angles; a rhomb; a lozenge; specifically, such a figure printed in red on a playing-card. -4. A playing-card stamped with one or more red lozenge-shaped figures.-5. A tool armed with a diamond, used for cutting gla . Diamonds so used are uncut, and they are so mounted as to act upon the gla , not by an angle, but by a curvilinear edge of the crystal. 6. In base - ball, the square space inclosed within the four bases. See base - ball.-7. In her., the tincture black in blazoning by means of precious stones. See blazon, n.-8. The smallest size of tral manner. diametric (di-a-met'rik), a. Same as diametri cal. [Rare.] diametrical (di-a-met'ri-kal), a. [ than pearl. Brilliant, very rarely used, is the only regular size below it. This line is printed in diamond. Black diamond. (a) Same as bort, 2. (6) Mineral coal, as consisting, like diamonds, of carbon. [Colloq.] - Bristol Every portion of a current proceeding in a diametrical direction from the equator to the centre must progre ively rise in temperature. - Cornish diamonds, quartz crystals found in the tin mines of Cornwall. Diamond cut diamond, the case of an encounter between two very sharp persons. - Matura diamond, a name given in Ceylon to zircon from the district of Matura. - Plate diamond. See the extract. The cleavage of certain of the African diamonds is so eminent that even the heat of the hand causes some of posites. Diametrical opposition, an expre ion ap- plied by Aristotle to the extreme of opposition; the rela- tion between two propositions which differ as much from each other as two propositions in the same terms can. At all events he had exposed himself to reproach by di- a metrical opposition to the profe ion of his whole life. Macaulay . diametrically (di-a-met'ri-kal-i), adv . In a di- a metrical direction; directly; in an extreme degree. sects: applied to flowers.