Reihe IV

Six string models of order two the most important intersections are shown on the models.

Number Title Date of Design Dimension (cm) Material
Reihe IV, nr. 401 Sphere. - 32-32-32 String
Reihe IV, nr. 403 A two sheeted hyperboloid. - 34 String
Reihe IV, nr. 404 A one sheeted hyperboloid.. - 34 String