Series XXV

Number

Title

Date of Design

Dimension (cm)

Material

S25.1

Cubic cone of genus one with return side

1899

h = 17

metal and wire

S25.2

Cubic cone of genus one with double side as self-intersection

1899

h = 17

S25.3

Cubic cone of genus zero with isolated double side

S25.4

Cubic cone of genus one: I one orientable and one non-orientable sheet. II one nonorientable sheet

S25.5/6

Cubic cone of genus one with one nonorientable sheet