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a horizontal line supposed to be drawn on the surface of a tilted stratum. It is at right angles to the dip.

but so inclined to the axis that the section is a circle; applied also to two similar triangles when so placed as to have a common angle at the vertex, the opposite sides not being parallel. Brande & C.

A mark made on the molds of a ship, when building, to show where the angles of the timbers are to be placed. [Written also sirmark.]

ingle base, and connecting it with various points in the tract surveyed by a series of triangles, the angles of which are carefully measured, the relative positions and distances of all parts being computed from these data.

A symbol or ornament in the form of a Greek cross with the ends of the arms at right angles all in the same direction, and each prolonged to the height of the parallel arm of the cross. A great many modified forms exist, ogee and volute as well as rectilinear, while various decorative designs, as Greek fret or meander,…

Growing on the angles of a stem, as the leaves in some species of Selaginella.

lee and shifting the tacks and sails so that she will proceed to windward nearly at right angles to her former course.

rease or diminish the velocity; -- distinguished from a normal force, which acts at right angles to the tangent and changes the direction of the motion without changing the velocity. -- Tangential stress. (Engin.) See Shear, n., 3.

onfusedly, or so interwoven as not to be easily disengaged; a snarl; as, hair or yarn in tangles; a tangle of vines and briers. Used also figuratively.

of Spongiæ in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinæ.

A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc.

Of or pertaining to a tetragon; having four angles or sides; thus, the square, the parallelogram, the rhombus, and the trapezium are tetragonal fingers.

edron belongs. Tetrahedral angle (Geom.), a solid angle bounded or inclosed by four plane angles.

A solid figure inclosed or bounded by four triangles.

Having four branches diverging at right angles; -- said of certain spicules of sponges.

inuous maximum descent from any point on a land surface, or that cutting all contours and angles.

used, especially in trigonometrical surveying, for the accurate measurement of horizontal angles, and also usually of vertical angles. It is variously constructed.

Having three corners, or angles; as, a three-cornered hat.

ne worked anchor-stock fashion (that is, tapered from the middle to both ends); also, the angles of the stern timbers at the counters. J. Knowles.

ent for drawing ellipses, one part of which consists of a cross with two grooves at right angles to each other, the other being a beam carrying two pins (which slide in those grooves), and also the describing pencil.