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ns, and reactions of a compound; graphic; -- said of formulæ. See under Formula. Rational horizon. (Astron.) See Horizon, 2 (b). -- Rational quantity (Alg. ), one that can be expressed without the use of a radical sign, or in extract parts of unity; -- opposed to irrational or radical quantity. -- Rational symptom (M…

he angle which the plane of the dial makes with a vertical plane which it intersects in a horizontal line. Brande & C.

A device consisting of radial arms with horizontal stats, connected with a harvesting machine, for holding the stalks of grain in position to be cut by the knives. Reel oven, a baker's oven in which bread pans hang suspended from the arms of a kind of reel revolving on a horizontal axis. Knight.

Pertining to, or of the same horizon as, certain Mesozoic strata of the Rhetian Alps. These strata are regarded as closing the Triassic period. See the Chart of Geology.

-- Right sphere (Astron. & Geol.), a sphere in such a position that the equator cuts the horizon at right angles; in spherical projections, that position of the sphere in which the primitive plane coincides with the plane of the equator.

To appear above the horizont, as the sun, moon, stars, and the like. "He maketh his sun to rise on the evil and the good." Matt. v. 45.

Attaining a higher place; taking, or moving in, an upward direction; appearing above the horizon; ascending; as, the rising moon.

oof, etc. (Arch.) See under Bell, French, etc. -- Flat roof. (Arch.) (a) A roof actually horizontal and level, as in some Oriental buildings. (b) A roof nearly horizontal, constructed of such material as allows the water to run off freely from a very slight inclination. -- Roof plate. (Arch.) See Plate, n., 10.…

Applied to the method delivering the ball in bowling, by swinging the arm horizontally. R. A. Proctor.

A horizontal wheel or frame, commonly with wooden horses, etc., on which children ride; a merry-go-round. Smart.

The horizontal distance to which a drift may be carried, either by license of the proprietor of a mine or by the nature of the formation; also, the direction which a vein of ore or other substance takes.

A horizontal channel in a mold, through which the metal flows to the cavity formed by the pattern; also, the waste metal left in such a channel.

The tincture black; -- represented by vertical and horizontal lines each other.

To sink, in the middle, by its weight or under applied pressure, below a horizontal line or plane; as, a line or cable supported by its ends sags, though tightly drawn; the floor of a room sags; hence, to lean, give way, or settle from a vertical position; as, a building may sag one way or another; a door sags on its h…

he bases of Ionic and Corinthian columns, generally without moldings, and of smaller size horizontally than the pedestal.

or pertaining to a sundial. Sciotheric telescope (Dialing), an instrument consisting of a horizontal dial, with a telescope attached to it, used for determining the time, whether of day or night.

it is called a zenith sector. Dip sector, an instrument used for measuring the dip of the horizon. -- Sector of a sphere, or Spherical sector, the solid generated by the revolution of the sector of a circle about one of its radii, or, more rarely, about any straight line drawn in the plane of the sector through its ve…

kes the ear sensible of its approaching sound. Called also the leading tone. -- Sensible horizon. See Horizon, n., 2. (a).

To pass below the horizon; to go down; to decline; to sink out of sight; to come to an end. Ere the weary sun set in the west. Shak. Thus this century sets with little mirth, and the next is likely to arise with more mourning. Fuller.

A flat tablet or ledge of any material set horizontally at a distance from the floor, to hold objects of use or ornament.