A Military Dictionary and Gazetteer / Comprising ancient and modern military technical terms, historical accounts of all North American Indians, as well as ancient warlike tribes; also notices of battles from the earliest period to the present time, with a concise explanation of terms used in heraldry and the offices thereof. The work also gives valuable geographical information. Compiled from the best authorities of all nations. With an appendix containing the Articles of war, etc.

by Thomas Wilhelm

Angle of Incidence is that which the line of direction of a ray of light, ball from a gun, etc., makes at the point where it first touches the body it strikes against, with a line drawn perpendicularly to the surface of that body.

Angle of Reflection is the angle intercepted between the line of direction of a body rebounding after it has struck against another body, and a perpendicular erected at the point of contact.

Angle of Sight, in gunnery, is the angle included between the line of sight and line of fire. Angles of sight are divided into natural and artificial angles of sight, corresponding to the natural and artificial lines of sight, which inclose them. See [Pointing].

Angle of the Centre is the angle formed at the centre of the polygon by lines drawn thence to the points of two adjacent bastions.

Angle of the Epaule, or Shoulder, is formed by one face and one flank of the bastion.

Angle of the Face is formed by the angle of the face and the line of defense produced till they intersect each other.

Angle of the Flank is that formed by the flank and curtain.

Angle of the Line of Defense is that angle made by the flank and the line of defense.

Angle of the Polygon is that formed by the meeting of two of the sides of the polygon; it is likewise called the polygon angle.

Angle of the Tenaille, or Flanking Angle, is made by two lines fichant,—that is, the faces of the two bastions extended until they meet in an angle towards the curtain, and is that which always carries its point towards the outworks.