Serie XVI; Plaster models for study of confocal surfaces of grade two

Number Title Date of Design Dimension (cm) Material
Serie XVI, nr. 1 Ellipsoid with three basic intersections and eighteen lines of curvature. 1888 16-14-9 Plaster
Serie XVI, nr. 3 Sphere with three maximal circles and eighteen confocal spherical conic sections. 1888 14,5 Plaster