Series XIII

Number

Title

Date of Design

Dimension (cm)

Material

S13.1

Ruled surface with two real double lines and four pinch points on each line

1886

18 x 18 x 18

Metal frame with wires

S13.4

Ruled surface with two conjugated imaginary double lines

1886

18 x 18 x 18

Metal frame with wires

S13.9

Ruled surface with cubic double curve and four pinch points

S13.10