ÆGILOPS, a Tumor, or rather Ulcer, in the great Canthus or Angle of the Eye, by the Root of the Nose; either with or without an Inflammation. See EYE, TUMOR, and ULCER.
The Word, in its original Greek, aigylops, signifies a Goat's Eye; in regard, Goats are supposed extremely liable to this Disorder. If the Agilops be neglected, it bursts, and degenerates into a Fistula, which eats into the Bone. See FISTULA.
The Word, in its original Greek, aigylops, signifies a Goat's Eye; in regard, Goats are supposed extremely liable to this Disorder. If the Agilops be neglected, it bursts, and degenerates into a Fistula, which eats into the Bone. See FISTULA.
ALTITUDE, Altitudo, in Geometry, the third Dimension of a Body; called also Height, or Depth. See HEIGHT; see also BODY, DIMENSION, etc.Altitude, in Optics, is usually considered as the Angle subtended between a Line drawn through the Eye, parallel to the Horizon, and a Visual Ray emitted from an Object to the Eye.For the Laws of the Vision of Altitude, see Vision.If through the two Extremes of an Object, S and T, (Tab. Optics, Fig. 13.) two Parallels, TV and SQ, be drawn; the Angle TVS, intercepted between a Ray passing through the Vertex S, and terminating the Shadow thereof in V, makes, with the right Line TV, what is called, by some Writers, the Altitude of the Luminary. Altitude, in Cosmography, is the perpendicular Height of a Body, or Object; or its Distance from the Horizon, upwards. See HEIGHT; see also HORIZON. Altitudes are divided into accessible and inaccessible. See ACCESSIBLE, and INACCESSIBLE. There are three Ways of Measuring Altitudes, viz. Geometrically, Trigonometrically, and Optically —The first is somewhat indirect and unartful; the second, performed by means of Instruments for the Purpose; and the third by Shadows. The Instruments chiefly used in measuring of Altitudes, are the Quadrant, Theodolite, Geometrical Quadrat, or Line of Shadows, &c. the Descriptions, Applications, &c. whereof, see under their respective Articles, QUADRANT, Theodolite, Quadrat.