Perpendiculars To The Sides Of An Angle
Illustration used to show "The two perpendiculars to the sides of an angle from any point not in its…
Polyhedral Angle
Illustration of polyhedral angle. "The opening of three or more planes which meet at a common point…
Straight Angle
An illustration showing a straight angle. When the sides of an angle extend in opposite directions,…
Trihedral Angle
Trihedral angle. "The sum of any two face angles of a trihedral angle is greater than the third face…
Adjacent Angles
An illustration of two angles that are adjacent. They have the same vertex and a common side between…
Equal Dihedral Angles
Illustration of 3 equal dihedral angles. "Two dihedral angles have the same ratio as their plane angles."
Equal trihedral angles
Illustration used to show that two trihedral angles are equal or symmetrical when the three face angles…
Right Angles With Same Vertex
An illustration showing when one straight line meets another straight line and makes the adjacent angles…
Vertical Angles
Vertical angles are when two angles have the same vertex, and the sides of the one are prolongations…
Approximate Ellipse using Lines
"When the minor axis is at least two-thirds the major, the following method ma be used: Make CF and…
Distribution of Magnetic Lines, Ring Armature
"Distribution of magnetic lines through a ring armature. Since the lines follow the metal of the ring…
Paly Bendy
"Produced by lines drawn vertically, by others drawn diagonally, or by a compound of Paly and Bendy."—Aveling,…
Circle With Diameter, Radius, Segment, Line
Illustration showing a circle with a diameter, radius, lines, triangle, and segment drawn.
Circle Inscribed in a Right Triangle
Illustration showing the diameter of a circle inscribed in a right triangle is equal to the difference…
Circle With Inscribed Triangle and Radii
Illustration showing a circle with an inscribed triangle and radii.
Circle With Various Chords And Tangents
Illustration showing a circle with various chords and tangents drawn.
Circle With Various Chords And Tangents
Illustration showing a circle with various chords and tangents drawn.
Circle With a Right Triangle
Illustration where one leg of a right triangle is the diameter of a circle. The tangent at the point…
Circle With a Tangent Line and Chord
Illustration showing that from any point in the circumference of a circle, a chord and a tangent are…
Two Intersecting Circles With Lines
Illustration showing 2 intersecting circles with a line drawn through each point of intersection terminated…
Two Intersecting Circles With Lines
Illustration showing 2 intersecting circles with a lines drawn that form a triangle.
Tangent Circles With Chords
Illustration showing 2 circles with that touch each other and two lines drawn through the point of contact…
Spherical Cone
"If a sector revolves about its bounding radius as an axis, it generates what may be called a spherical…
Construction of Bisecting a Given Angle
Illustration of the construction used to bisect a given angle.
Construction of Bisecting a Given Line
Illustration of the construction used to bisect a given line.
Construction of an Equal Angle Given a Point and a Straight Line
Illustration of the construction used to create an equal angle given a point in a given straight line…
Construction of Perpendicular Upon a Given Line From an External Point
Illustration to let fall a perpendicular upon a given line from a given external point.
Construction of Perpendicular From a Given Point on a Straight Line
Illustration of the construction of a perpendicular to a line when given a point O on the straight line.
Construction of Perpendicular From a Given Point on a Straight Line
Illustration of the construction of a perpendicular to a line when given a point B on the straight line.
Construction of a Straight Line Divided Into Equal Parts
Illustration of the construction used to divide a straight line into a given number of equal parts.
Construction of a Straight Line Parallel to a Given Straight Line
Illustration of the construction used to create straight line parallel to a given straight line through…
Curve Inked with Circle Arcs
"Any noncircular curve may be approximated by tangent circle arcs, selecting a center by trial, drawing…
Drawing Irregular Isometric Curves of Solid
The illustration of an irregular curves for solid. The isometric projection of the curve can be drawn…
Angle of Depression
Illustration showing an angle of depression from a horizontal line to a line of sight.
Construction Of Dividing A Line
Illustration used to show how to divide a given straight line into required number of equal parts.