Illustration showing that if one diameter is conjugate to a second, the second is conjugate to the first.

Illustration of half of an ellipse and its auxiliary circle used to construct an ellipse by points,…

Illustration of half of an ellipse. "If d denotes the abscissa of a point of an ellipse, r and r' its…

Illustration of half of an ellipse. "If through a point P of an ellipse a line is drawn bisecting the…

Illustration of half of an ellipse. The square of the ordinate of a point in an ellipse is to the product…

Illustration showing that tangents drawn at the ends of any diameter are parallel to each other.

Illustration of half of an ellipse. "The sum of the distances of any point from the foci of an ellipse…

Illustration of how to draw a tangent to an ellipse from an external point.

Diagram an ellipse with a tangent line that illustrates "A line through a point on the ellipse and bisecting…

Illustration showing the tangents drawn at two corresponding points of an ellipse and its auxiliary…

An illustration showing how to construct an equilateral triangle inscribed in a circle. "With the radius…

This diagram shows the bones of the right fore-arm. H, the humerus; R, the radius; and U, the ulna.

Transverse section through the bones of the forearm (radius and ulna), taken at about the middle of…

Section one inch above the styloid process of the right radius.

Section three inches above the styloid process of the right radius.

Section through the styloid process of the right radius.

Section two inches above the styloid process of the right radius.

The muscles and nerves on the front of the forearm and hand. The pronator radii teres, flexor carpi…

Section across the forearm in the middle third. Labels: A, pronator radii teres; B, flexor carpi radialis;…

A section across the forearm a short distance below the elbow-joint. R and U, its two supporting bones,…

Two students drawing geometrical shapes on the chalkboard. A student is also using a scale while students…

The little finger on the left hand can guide the needle point of the compass to the center.

An illustration showing how to construct a hexagon in a given circle. "The radius of the circle is equal…

Diagram part of a hyperbola with a tangent line that illustrates "A line through a point on the hyperbola…

"Showing how the Ends of the Bones are shaped to form the Elbow Joint. The cut ends of a few ligaments…

"Skeleton and volar Membranes of the Noctule Bat. c, clavicle; h, humerus; r, radius; u, ulna; d1, first…

An illustration showing how to construct a pentagon inscribed in a circle. "Draw the diameter AB, and…

An illustration showing how to construct a pentagon on a given line. "From B erect BC perpendicular…

Illustration showing a circle inscribed in a regular pentagon. Or, a regular pentagon circumscribed…

Illustration of a circle with center O and diameters AB and CD perpendicular to each other.

Illustration used to draw lines which are radii of a circle where the center is inaccessible.

Anterior view of radius (bone of the arm) of the right side. Labels: 1, cylindrical head; 2, surface…

"When a bone is broken, blood trickles out between the injured parts, and afterwards gives place to…

Carpal articular surface of the radius, and triangular fibro cartilage of the wrist.

Showing the situation of Colle's fracture of the radius, with fracture of the styloid of the ulna. The…

Illustration of ring (small circle in larger concentric circle) with piece cut out.