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Complete set of cardboard models of second order surfaces in original packing by L. Brill of Darnstadt

circa 1900

Set of models of singularities in mathematical surfaces devised by Helga Lund in 1908

1908

Cardboard models of Second Order Surfaces, 1901.

1901
Set of 7 unassembled cardboard geometrical models in 4 packages showing surfaces of the second order on wooden stands [marked 1876-482]: (1) Ellipsoids having 22 sections, (2) Ellipsoids having 30 sections, (3) Hyperboloids of 2 sheets, (4) Hyperboloids of 1 sheet, (5) Paraboloids, (6) Hyperbolic Paraboloids, (7) Cones

Set of 7 unassembled cardboard geometrical models

1901