Dial (Instrument for showing)
an instrument for showing the time of day by the sun's shadow. It is evident that the dial having a gnomon which makes with the horizontal plane equal the latitude of the an angle the Asiatics place is the invention of Dials are of-various construction, according to the presentation of the plane of the dial. A dial in telegraphy is an insulated, stationary wheel having alternating conducting and non-conducting portions, against which the point of a spring key is in frictional contact.
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Dial Work
The motion work of a watch between the dial and the movement plate.
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Dial, The
The, a famous American quarterly published for four years in Boston. It was a literary journal, and the recognized organ of the Trancendentalists. The first editor was Margaret Fuller, who, assisted by Ripley, Emerson, and others, filled the position from 1840 to 1842. Emerson was the editor during 1842-44. In 1902 The Dial was reprinted with an introduction by G.W. Cooke.
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Dialect
discourse; conversation; speech; language; argument; phraseolo- . gy; manner of speaking or expression In the philosophical sense of the word, another in a language which resembles its general features, but differs from it in detail. The two most widely spread world are families of language in the Semitic. In the Indian-Gothic, Gothic, and the the Sanskrit, the former are included Zend, Armenian, Greek, Latin, Lithuanian, Slavonic, Teutonic, and Celtic dialects. In all these, the resemblance, though often far distant, is able to be traced. The Semitic embraces the Hebrew, Syriac, Arabic, and other dialects not so well known.
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Dialectics
the old name for logic, or the art of reasoning and disputing justly. There were several systems of dialectics among the ancients. The dialectics of Plato are a kind of analyses to direct the human mind by dividing, defining, and bringing things to the first truth; which having reached, sensible it applies itself to explain return to the things, but with a view to first truth, where alone it can rest. The docdialectics of Aristotle comprise the delivered in his trine of simple words, de book of "Predicaments"; the doctrine of propositions, contained in his book "De and that of the several Interpretatione"; , in his books of "Ankinds of syllogism alytics," "Topics," and "Elenchuses." In modern times various systems of dialectics have been propounded in different countries.
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Dialing
The art of constructing dials. The science which explains the principles of measuring time by the sun dial.
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Diallage
a silico-magnesian mineral of a lamellar or foliated structure. Its sub-species are green diallage, hypersthene, and bronzite. The metalloidal or sub-species is called schillerstein, spar. It forms diallage rock, schiller and enters into serpentine.
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Dialling
the art of making sundials; also the art and practice of minesurveying, in which the theodolite, magnetic needle, etc., are employed.
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Dialogue
a conversation or discourse between two or more persons. The word is used more particularly for a formal conversation in theatrical performances, and for a written conversation or composition, in which two or more persons carry on a discourse. This form was much in favor among the ancient philosophers as a medium for expressing their thoughts on subjects. The "Dialogues of Plato" are the finest example.
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Dialysis
a phenomenon observed by Thomas Graham in the middle of last century, consisting in the passage through an animal membrane or parchment of solutions of crystalloids, such as salt or sugar. He carried out his experiments by placing the dialyzer (i. e., a vessel having a bottom made of parchment) in a larger vessel filled with water. He then found that when a crystalloidal solution was poured into the dialyzer, the substance in solution would pass through the diaphragm into the water in the outer vessel. Colloidal solutions, however, would not pass through such diaphragms and so Graham was able to separate colloidal from crystalloidal substances by this means.
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Diamagnetism
the moving of bodies such as iron, when placed in a 1 2 5 4 1. Top of rose cutting 2. Side of rose cutting 3. Briolette cutting field of magnetic force, from places of weaker to places of stronger force. The opposite is true of bismuth and other substances. Such substances are said to be diamagnetic.
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Diamantina
a town in the Brazilian province of Minas Geraes. It is the center of a rich diamond district; has manufactures of cotton and goldware, and is the seat of a Roman Catholic bishop. Pop. 13,000.
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Diamantine
This polishing agent is used extensively for polishing steel, and is a preparation of crystallized boron. It is not applicable to brass or copper work. Rubitine and Sapphirine are similar chemical preparations; they act quicker, but do not yield as good results.
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Diameter
in geometry, a line drawn passing through the center of a circle or other curvilinear figure, and terminating each way in the circumference. That point which bisects all lines drawn through a figure from side to side is called a center, and every line drawn through a center and terminating in the circumference or opposite boundaries is a diameter. Every circle has an infinite number of diameters. A diameter which is perpendicular to the chords which it bisects is called an axis. A circle has an infinite number of axis, every diameter being an axis. The parabola has one axis and each of the other conic sections two axes.
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Diameter
A line, which passing through the centre of a circle or other curvilinear figure, divides it or its ordinates in two equal parts. Also, the length of a straight line through the centre of an object, from side to side, as the diameter of a cylinder, fly-wheel, etc.
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Diamond and Brilliant Imitations
To make metal imitations of these precious stones, procure a glass rod and grind the end to the form of whatever it is intended to imitate. Dip the ground end of the rod into reflector metal, which has been previously freed from scum; the metal will adhere to the ground surface and form a hollow cap of extreme brilliancy which answers to the design ground on the end of the rod. See REFLECTOR METAL. Dies, To harden.--In order to produce an equal degree of hardness throughout the entire surface of a die, it has been found best to let fall a copious stream of water from a reservoir placed above, directly upon the centre of the die. This is a superior method to direct immersion, as the rapid formation of steam at the sides of the die, consequent on the later mode, prevents free access of the water for removing the heat with the expedition requisite for obtaining a hard surface at the centre. See TEMPERING; STAMPING.
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