An illustration showing how to construct a center and radius of a circle that will tangent the three…

"Three center arches, employed in French Flamboyant." — The Encyclopedia Britannica, 1910

"Four center arches, employed in the Perpendicular and Tudor periods." — The Encyclopedia Britannica,…

"Why does a person carrying a weight upon his back stoop forward? In order to bring the center of gravity…

"Why does a person carrying a weight upon his back stoop forward? In order to bring the center of gravity…

"The center of gravity, in any body or system of bodies is that point upon which the body, or system…

"But if one of the balls be heavier than the other, then the centre of gravity will, in proportion,…

"In a body of equal thickness, as a board, or a slab of marble, but otherwise of an irregular shape,…

"If w and W, fig. 3, be two bodies of known weight, their center of gravity will be at C." —Hallock…

"The part of the body in which the centre of gravity is situated, may be found, in some cases, by balancing…

"When such a surface is irregular in shape, suspend it at any point, so that it may move freely, and…

"Where five blocks are placed in this position, the point of gravity is near the centre of the thrd…

"Find the center of gravity of two of the bodies, as W1, and W4, in fig 4. Assume that the weight of…

"A load of hay...upsets where one wheel rises by little above the other, because it is broader on the…

"To find the center of gravity of any irregular plane figure, but of uniform thickness throughout, divide…

"When a line of direction falls within the base, a body stands when not, it falls... On the same principle,…

"When two bodies of equal weight are connected by a rod, the centre of gravity will lie in the middle…

"When a ball is rolling on a horizontal plane, the centre of gravity is not raised, but moves in a straight…

"In a body free to move, the center of gravity will lie in a vertical plumb-line drawn through the point…

"But, suppose the same bar or iron, whose inertia was overcome by raising the centre, to have balls…

"A body's center of mass is the point about which all matter composing the body may be balanced. It…

"Let any irregularly shpaed body, as a stone or chair, be suspended so as to move freely. Drop a plumb…

"A crystal has a center of symmetry if an imaginary line is passed from some point on its surface through…

Circle with 36 degree angles marked. This diagram can be used with the following trig problem: Locate…

Circle modeling the earth. O is the center of the earth, r the radius of the earth, and h the height…

Circle with chord AB=2 ft. and radius OA = 3 ft.. Triangle AOC is a right triangle. Angle AOC=half angle…

Illustration of a square, with diagonals drawn, circumscribed about a circle. This can also be described…

Illustration of a square, with 1 diagonals drawn, circumscribed about a circle. This can also be described…

Illustration of a square circumscribed about a circle. This can also be described as a circle inscribed…

Illustration of a square, with diagonals drawn, inscribed in a circle. This can also be described as…

Illustration used to prove "If two circumferences meet at a point which is not on their line of centers,…

A market cross is a structure used to mark a market square in market towns, originally from Western…

Illustration of blueprint used by highway engineers to widen the pavement on the inside of the curve…

"If we suppose a spectator placed at G, in the Earth's center, he would see the moon E, among the stars…

"The Earth, whose diameter is 7,912 miles, is represented by the globe, or sphere. The straight line…

Illustration of half of an ellipse. "The ordinates of two corresponding points in an ellipse and its…

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 an ellipse with foci F' and F, major axis A' to A, minor axis B' to B, and center O.

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.

Diagram of an ellipse that can used to illustrate the different parts. Segment MN is the major axis,…

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.

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…

"FESS POINT. The exact centre of the escutcheon, as seen in the annexed example." -Hall, 1862

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

"HONOUR POINT. That part of the shield between the precise middle chief and the fess point. In the annexed…

The central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes

"When the rays diverge from a point beyond the center of curvature, as B, the focus falls on the same…

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…