"A series of planes as S—S are passed perpendicular to the axis of revolution, cutting out the…

"Nodal Cubic, with four primary lines and their satellite. In the diagram, ABC is the satellite line.…

Illustration of the intersection of a square pyramid and a plane.

Illustration of the intersection of a square pyramid and a plane.

Illustration to show if the bisector of the base angles of a triangle are drawn, and through their point…

Illustration used to show "Any two medians of a triangle intersect each other in a trisection point…

Illustration of the intersection of a triangular pyramid and a plane.