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Illustration used to show how to draw an egg-shaped oval when given the diameters.

Construction Of Oval

Illustration used to show how to draw an egg-shaped oval when given the diameters.

Illustration showing the definition of a parabola as a conic section. "The section of a right circular cone made by a plane parallel to one, and only one, element of the surface is a parabola."

Conic Section Showing Parabola

Illustration showing the definition of a parabola as a conic section. "The section of a right circular…

Illustration showing the definition of a parabola as a conic section. "The section of a right circular cone made by a plane parallel to one, and only one, element of the surface is a parabola."

Conic Section Showing Parabola

Illustration showing the definition of a parabola as a conic section. "The section of a right circular…

Illustration showing the definition of a parabola as a conic section. The section of a right circular cone made by a plane parallel to one, and only one, element of the surface is a parabola.

Conic Section Showing A Parabola

Illustration showing the definition of a parabola as a conic section. The section of a right circular…

An illustration showing the intersection of a plane and a cone. The cone is intersected by a plane parallel to a side. Thus forming a parabola.

Conic Section Showing A Parabola

An illustration showing the intersection of a plane and a cone. The cone is intersected by a plane parallel…

Illustration used to show how to draw a parabola when the axis and longest double ordinate is given.

Construction Of Parabola

Illustration used to show how to draw a parabola when the axis and longest double ordinate is given.

Illustration of a parabola showing that any point of a parabola is the mean proportional between the latus rectum (focal chord) and the abscissa (x-coordinate).

Parabola With Coordinates and Latus Rectum

Illustration of a parabola showing that any point of a parabola is the mean proportional between the…

Illustration of a parabola - a curve which is the locus of a point that moves in a plane so that its distance from a fixed point in the plane is always equal to its distance from a fixed line in the plane.

Parabola With Focus and Directrix

Illustration of a parabola - a curve which is the locus of a point that moves in a plane so that its…

Illustration of a parabola - a curve which is the locus of a point that moves in a plane so that its distance from a fixed point (focus) in the plane is always equal to its distance from a fixed line (directrix) in the plane.

Parabola With Focus and Directrix

Illustration of a parabola - a curve which is the locus of a point that moves in a plane so that its…

Illustration of a parabola showing point P is equidistant to the focus and the directrix.

Point on Parabola

Illustration of a parabola showing point P is equidistant to the focus and the directrix.

Illustration of a parabola. "If a line PT is drawn from any point P of the curve, bisecting the angle between PF and the perpendicular from P to the directrix, every point of the line PT, except P, is without the curve."

Point on Parabola

Illustration of a parabola. "If a line PT is drawn from any point P of the curve, bisecting the angle…

Illustration of a tangent line drawn from an external point to a parabola.

Tangent to a Parabola

Illustration of a tangent line drawn from an external point to a parabola.

Illustration showing that the area of a parabolic segment made by a chord is two thirds the area of the triangle formed by the chord and the tangents drawn through the ends of the chord.

Tangents and Chords of a Parabola

Illustration showing that the area of a parabolic segment made by a chord is two thirds the area of…

Illustration showing that if two tangents RP and RQ are drawn from a point R to a parabola, the line drawn through R parallel to the axis bisects the chord of contact.

Tangents to a Parabola

Illustration showing that if two tangents RP and RQ are drawn from a point R to a parabola, the line…

Illustration of a cross section of a Jalousie de Fontenay Vendee pear.

Jalousie de Fontenay Vendee Pear

Illustration of a cross section of a Jalousie de Fontenay Vendee pear.

An illustration of the cross section of a Portugal quince pear.

Cross section of a Portugal Quince Pear

An illustration of the cross section of a Portugal quince pear.

Illustration of a cross section of a Washington pear.

Washington Pear

Illustration of a cross section of a Washington pear.

Cross section of pipe, 2 concentric circles

Cross Section of Pipe

Cross section of pipe, 2 concentric circles

A section of the fruit of the primrose succisa, <em>scabious succisa</em>.

Section of primrose succisa fruit

A section of the fruit of the primrose succisa, scabious succisa.

Parallel vertical or columnar sections on the face of Pulpit Rock, near Colorado Springs, through identical strata, and only 20 feet apart; illustrating rapid lateral changes in the character of the strata.

Pulpit Rock Sections

Parallel vertical or columnar sections on the face of Pulpit Rock, near Colorado Springs, through identical…

"Section of Lime Purifier." &mdash; Encyclopedia Britannica, 1893

Purifier

"Section of Lime Purifier." — Encyclopedia Britannica, 1893

Signal to inform the troops that the next signal will be directed at a certain 'section' rather than everyone.

Section

Signal to inform the troops that the next signal will be directed at a certain 'section' rather than…

"Section and part elevation of a raking shore."—Finley, 1917

Raking Shore

"Section and part elevation of a raking shore."—Finley, 1917

"Diagrammatic section of spinal cord in cervical region."—Finley, 1917

Section of a Spinal Cord

"Diagrammatic section of spinal cord in cervical region."—Finley, 1917

"The valve gear for operating the steam hammer is shown separately, the cylinder and valve chest being in section."&mdash;Finley, 1917

Valve gear of a steam hammer

"The valve gear for operating the steam hammer is shown separately, the cylinder and valve chest being…

"1, longitudinal section; 2, 3, 4, cross section; 5, detached disk; 7, 8, fibrillae." &mdash; Richardson, 1906

Striped Muscle

"1, longitudinal section; 2, 3, 4, cross section; 5, detached disk; 7, 8, fibrillae." — Richardson,…

A section of a human vertebra, showing structure.

Section of Vertebra

A section of a human vertebra, showing structure.

"Ideal section, greatly enlarged, showing minute capillary circulations." &mdash;Brown, 1884

Villus

"Ideal section, greatly enlarged, showing minute capillary circulations." —Brown, 1884

"Transverse section of an Alcyonarian zooid. mm, mesenteries; mb, muscle banners; sc, sulcus; st, stomodaeum." &mdash;Encyclopedia Britannica, 1910

Alcyonarian Zooid

"Transverse section of an Alcyonarian zooid. mm, mesenteries; mb, muscle banners; sc, sulcus; st, stomodaeum."…