Serie I; Plaster models
| Number | Title | Date of Design | Dimension (cm) | Material |
| Serie I, nr. 2a | The enveloping surface of a system of rays of a paraboloid. The two components separated | 1877 | 10-10 and 7-7 | Plaster |
| Serie I, nr. 2b | The enveloping surface of a system of rays of a paraboloid. The two components associated | 1877 | 10-10-11 | Plaster |
| Serie I, nr. 3a | The enveloping surface of a system of rays of a one sheeted hyperboloid. The two components separate | 1877 | 17-17-16 | Plaster |
| Serie I, nr. 3b | The enveloping surface of a system of rays of a one sheeted hyperboloid. The two components associated. | 1877 | 10-10-18 | Plaster |
| Serie I, nr. 4 | The geodesics on an ellipsoid of revolution. | 1877 | 10-10-18 | Plaster |
| Serie I, nr. 5 | The geodesics on a 3-axis ellipsoid through the umbilic point. | 1877 | 10-18-18 | Plaster |