Serie VII; Plaster models of surfaces of order three

Number Title Date of Design Dimension (cm) Material
Serie VII, nr. 2 Surface with four real double points (A1). 1881 13-15 Plaster
Serie VII, nr. 4 Surface with 4 real ordinary double points. 1881 13-15 Plaster
Serie VII, nr. 5 Surface with 4 real ordinary double points. 1881 13-15 Plaster
Serie VII, nr. 6 Surface with 4 real ordinary double points. 1881 13-15 Plaster
Serie VII, nr. 7 Surface with 3 real ordinary double points. 1881 11-15 Plaster
Serie VII, nr. 8 Surface of the same kind, considered from the inside, for the formation of the D4 double point. 1881 11-15 Plaster
Serie VII, nr. 9 Surface with three real A2 double points. 1881 11-15 Plaster
Serie VII, nr. 10 Surface with an A2 double point, whose tangent planes at that point intersect the surface in three lines. The model is also valid for the transfer of the A2 into a D4 double point. 1881 10-15 Plaster
Serie VII, nr. 11 Surface with an A2 double point, whose tangent planes at that point are imaginary conjugated. 1881 12-15 Plaster
Serie VII, nr. 12 Surface with an A3 double point and two real ordinary (A1) double points. The tangent planes at the A3 double point are real. 1881 13-15 Plaster
Serie VII, nr. 14 Surface with an ordinary A1 double point and an A4 double point. 1881 13-15 Plaster
Serie VII, nr. 15 Surface with an ordinary A1 double point and an A5 double point. 1881 12-15 Plaster
Serie VII, nr. 16 Surface with a D4 double point, whose tangent plane intersects the surface in three real lines. 1881 12-15 Plaster
Serie VII, nr. 17 Surface with a D4 double point, whose tangent plane intersects the surface in one real line. 1881 12-15 Plaster
Serie VII, nr. 18 Surface with a D5 double point. 1881 12-15 Plaster
Serie VII, nr. 19 Surface with a E6 double point. 1881 12-15 Plaster
Serie VII, nr. 20 A ruled surface, whose double straight line is completely surrounded by a real sheet of the surface. 1881 13-15 Plaster
Serie VII, nr. 21 Ruled surface, with a double line limited by two cuspidal points at finite distance. 1881 13-15 Plaster
Serie VII, nr. 23 Cayley's ruled surface with a cuspidal point (at finite distance). 1881 13-15 Plaster
Serie VII, nr. 24a Hessian surface for models VII, 2 and VII, 5. 1881 21-25 Plaster
Serie VII, nr. 24b Star shaped part of the preceding for a pentaeder, which consists of the infinitely far plane and a regular tetrahedron. 1881 13-16 Plaster
Serie VII, nr. 25 Hessian surface for model VII, 7. 1881 21-25 Plaster