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Cardboard models of Second Order Surfaces, 1901.

1901
Set of 7 unassembled cardboard geometrical models in 4 separate packets, showing surfaces of the second order: (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 [NB stands marked 1876-842 hold paper models 1901-88 ]

Set of 7 unassembled cardboard geometrical models in 4 separate packets

1876
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