**Mathematical description**

This is a model representing a generalized cone. The cones are
special cases of ruled surfaces. A ruled surface is a surface that can be swept out by a moving line in
space. It has a parametrization of the form:

wherex(u,v) =b(u) + v δ(u),

A generalized cone is a ruled surface that can be parametrized by

wherex(u,v) =p+ v δ(u),

**Title model and translation**
Kegel dritter Ordnung vom Geschlechte Eins. I. Aus einem paaren und unpaaren Mantel bestehend. Oder II.
aus einem einzigen unpaaren Mantel bestehend.

A cone of order three of genus one. I. Existing of one converged and one diverged sheet. Or II. Consisting of a only one divergated sheet.

**Text on Sticker and translation**

Missing sticker.

**Designer**
Prof. Dr. H. Wiener

Darmstadt in 1899

**Company**

Martin Schilling in Leipzig

**Original price
**Mark 20

**Dimension
**17 cm

**Material
**String

**Literature**

Schilling, M., Catalog mathematischer Modelle für den höheren
mathematischen Unterricht, Leipzig: Verlag von Martin Schilling, 1911