"Epidermis of the garden Balsam, showing stomata st, of an elliptical form." — Encyclopedia Britanica, 1893

Balsam

"Epidermis of the garden Balsam, showing stomata st, of an elliptical form." — Encyclopedia Britanica,…

Every elliptical involution has the property that there are two definite points in the plane from which any two conjugate points are seen under a right angle.

Circular Involution

Every elliptical involution has the property that there are two definite points in the plane from which…

"Upright elliptical arch, sometimes called the egg-shaped arch, employed in Egyptian and Sassanian architecture." — The Encyclopedia Britannica, 1910

Elliptical Arch

"Upright elliptical arch, sometimes called the egg-shaped arch, employed in Egyptian and Sassanian architecture."…

"The elliptical circle being supposed to be the Earth's orbit, with the Sun, S, in one of the foci. Now the spaces, 1, 2, 3, etc., though of different shapes, are of the same dimensions, or contain the same quantity of surface. The Earth, we have already seen, in its journey round the Sun, describes an ellipse, and moves more rapidly in one part of its orbit than in another. But whatever may be its actual velocity, its comparative motion is through equal areas in equal times. Thus its center passes from E to C, and from C to A, in the same period of time, and so of all the other divisions marked in the figure." —Comstock, 1850

Elliptical Orbit

"The elliptical circle being supposed to be the Earth's orbit, with the Sun, S, in one of the foci.…

An elliptical shape of a shield or escutcheon in heraldry.

Elliptical Shield

An elliptical shape of a shield or escutcheon in heraldry.

A pendentive is a constructive device permitting the placing of a circular dome over a square room or an elliptical dome over a rectangular room. The pendentives, which are triangular segments of a sphere, taper to points at the bottom and spread at the top to establish the continuous circular or elliptical base needed for the dome. In masonry the pendentives thus receive the weight of the dome, concentrating it at the four corners where it can be received by the piers beneath.

Diagram of Pendentives

A pendentive is a constructive device permitting the placing of a circular dome over a square room or…

"Elliptical Orbits.—It has been supposed that the Sun's attraction, which constitutes the Earth's gravity, was at all times equal, or that the Earth was at an equal distance from the Sun, in all parts of its orbit." —Comstock, 1850

Planet Motion

"Elliptical Orbits.—It has been supposed that the Sun's attraction, which constitutes the Earth's…