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# Reihe IV, Nr 401

## Sphere.

**Mathematical description**

This model is a surface of revolution generated by rotating a curve about an axis.
In this case, the surface is the sphere.
The model consists of three iron circles representing three maximal circles of the sphere, and three red strings representing their diameters.

**Title model and translation**

Kugel.

Sphere.

**Text sticker and translation**

No sticker.

**Designer**

H. Wiener in Darmstadt.

**Company**

H. Wiener in Darmstadt.

**Original price**

Mark 10,-

**Dimension**

32-32-32 cm

**Material**

String

**Literature**

Verzeignis Mathematischer modelle; H. Wieners sammlung mathematischer modelle, Verlagsbuchhandlung
B.G.Teubner, Leipzig, 1905