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…

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…

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.

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…

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.

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

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…

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

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

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

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

"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." — Richardson,…

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