Series XVIII

Number

Title

Date of Design

Dimension (cm)

Material

S18.1

Cubic ruled surface: one of the directrix lines intersects the plane of the directrix

1891

20 x 20 x 20

Metal and thread

S18.3

Cubic ruled surface: one of the directrix lines intersects the plane of the directrix

1891

20 x 20 x 20

Metal and thread

S18.4

Cubic ruled surface of Cayley

189120 x 20 x 20

Metal and thread