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which does not spring from the impost and is not a ridge rib, but passes from one boss or intersection of the principal ribs to another.

dip (Geol.), a line in the plane of a stratum, or part of a stratum, perpendicular to its intersection with a horizontal plane; the line of greatest inclination of a stratum to the horizon. -- Line of fire (Mil.), the direction of fire. -- Line of force (Physics), any line in a space in which forces are acting, so dr…

The point of intersection of a vertical line through the center of gravity of the fluid displaced by a floating body which is tipped through a small angle from its position of equilibrium, and the inclined line which was vertical through the center of gravity of the body when in equilibrium.

Having one oblique intersection; -- said of that system of crystallization in which the vertical axis is inclined to one, but at right angles to the other, lateral axis. See Crystallization.

Right-angled; rectangular; as, an orthogonal intersection of one curve with another. Orthogonal projection. See under Orthographic.

A kind of curve; one of the conic sections formed by the intersection of the surface of a cone with a plane parallel to one of its sides. It is a curve, any point of which is equally distant from a fixed point, called the focus, and a fixed straight line, called the directrix. See Focus.

A mock moon; an image of the moon which sometimes appears at the point of intersection of two lunar halos. Cf. Parhelion.

A number of lines that intersect in one point, the point of intersection being called the pencil point.

fixed conventional place for reference, or zero of reckoning, in the heavens, usually the intersection of two or more great circles of the sphere, and named specifically in each case according to the position intended; as, the equinoctial points; the solstitial points; the nodal points; vertical points, etc. See Equino…

punctual sun." Cowper. These sharp strokes [of a pendulum], with their inexorably steady intersections, so agree with our successive thoughts that they seem like the punctual stops counting off our very souls into the past. J. Martineau.

The intersection of two surface forming a salient angle, especially the angle at the top between the opposite slopes or sides of a roof or a vault.

church, over which the rood was placed. Fairholt. -- Rood tower (Arch.), a tower at the intersection of the nave and transept of a church; -- when crowned with a spire it was called also rood steeple. Weale. -- Rood tree, the cross. [Obs.] "Died upon the rood tree." Gower.

A cutting; an intersection; as, the point of secancy of one line by another. [R.] Davies & Peck (Math. Dict. ).

a. -- Solid problem (Geom.), a problem which can be construed geometrically, only by the intersection of a circle and a conic section or of two conic sections. Hutton. -- Solid square (Mil.), a square body or troops in which the ranks and files are equal.

A nonplane curve formed by the intersection of the surface of an oblique cone with the surface of a sphere whose center is at the vertex of the cone.

a solid block of houses; also, an open place or area for public use, as at the meeting or intersection of two or more streets. The statue of Alexander VII. stands in the large square of the town. Addison.

luminous spot occasionally seen a few degrees from the sun, supposed to be formed by the intersection of two or more halos, or in a manner similar to that of halos.

The intersection of a plane of projection, or an original plane, with a coordinate plane.

Math.), a fraction which reduces to the form Math. Dict. -- Vanishing line (Persp.), the intersection of the parallel of any original plane and picture; one of the lines converging to the vanishing point. -- Vanishing point (Persp.), the point to which all parallel lines in the same plane tend in the representation.…

Parallel lines that are made to appear convergent or divergent by means of oblique intersections.