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A bar, connected with a switch, longer than the distance between any two consecutive wheels of a train (45 to 50 feet), laid inside a rail and operated by the wheels so that the switch cannot be thrown until all the train is past the switch.

c. The determinant is written by placing the numbers from which it is formed in a square between two vertical lines. The theory of determinants forms a very important branch of modern mathematics.

of the iron parts of the ship. -- Deviation of the line of the vertical, the difference between the actual direction of a plumb line and the direction it would have if the earth were a perfect ellipsoid and homogeneous, -- caused by the attraction of a mountain, or irregularities in the earth's density.…

A double-walled glass vessel for holding liquid air, etc., having the space between the walls exhausted so as to prevent conduction of heat, and sometimes having the glass silvered to prevent absorption of radiant heat; -- called also, according to the particular shape, Dewar bulb, Dewar tube, etc.

A prefix denoting through; also, between, apart, asunder, across. Before a vowel dia- becomes di-; as, diactinic; dielectric, etc.

Differential diagnosis (Med.), the determination of the distinguishing characteristics as between two similar diseases or conditions.

An imaginary speech or discussion between two or more; dialogue. Fulke.

A conversation between two or more persons; particularly, a formal conservation in theatrical performances or in scholastic exercises.

A vacant space, or gap, esp. between teeth in a jaw.

ng two fourths; as, the diazeutic tone, which, like that from F to G in modern music, lay between two fourths, and, being joined to either, made a fifth. [Obs.]

Having two of the intersections between the three axes oblique. See Crystallization.

That part of a pedestal included between base and cornice; the dado.

of quality in paper; a difference in degrees of heat, or of light; what is the difference between the innocent and the guilty Differencies of administration, but the same Lord. 1 Cor. xii. 5.

ing in two air bulbs, and containing a colored liquid, used for indicating the difference between the temperatures to which the two bulbs are exposed, by the change of position of the colored fluid, in consequence of the different expansions of the air in the bulbs. A graduated scale is attached to one leg of the tube.…

faces; as, the dihedral summit of a crystal. Dihedral angle, the angular space contained between planes which intersect. It is measured by the angle made by any two lines at right angles to the two planes.

y by an incumbent, through neglect or by intention. The business of dilapidations came on between our bishop and the Archibishop of York. Strype.

Difference of form between members of the same species, as when a plant has two kinds of flowers, both hermaphrodite (as in the partridge berry), or when there are two forms of one or both sexes of the same species of butterfly. Dimorphism is the condition of the appearance of the same species under two dissimilar form…

A wether sheep between one and two years old. [Scot.]

or visible horizon below the true or natural horizon; the angle at the eye of an observer between a horizontal line and a tangent drawn from the eye to the surface of the ocean. -- Dip of the needle, or Magnetic dip, the angle formed, in a vertical plane, by a freely suspended magnetic needle, or the line of magnetic…

The soft, spongy, or cancellated substance between the plates of the skull.