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Cardboard models of Second Order Surfaces, 1901.

Cardboard models of Second Order Surfaces, 1901.

1901
Set of models of singularities in mathematical surfaces devised by Helga Lund in 1908

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

1908
Complete set of cardboard models of second order surfaces in original packing by L. Brill of Darnstadt

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

circa 1900
Assembled cardboard geometrical model on wooden display stand

Assembled cardboard geometrical model on wooden display stand

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
Unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E426-1877), Ellipsoids of 30 circular sections [ellipsoid II ].

Unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E426-1877)

1876
Unassembled cardboard geometrical models showing surfaces of the 2nd order(marked E424-1877), Paraboloid.

Unassembled cardboard geometrical models showing surfaces of the 2nd order(marked E424-1877)

1876
Unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E425-1877), Hyperbolic Paraboloid [Hyperbolisches Paraboloid].

Unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E425-1877)

1876
Unassembled cardboard geometrical models showing surfaces of the second order (marked E428-1877), Hyperboloid of 2 sheets [Zweischaliges Hyperboloid].

Unassembled cardboard geometrical models showing surfaces of the second order (marked E428-1877)

1876
Unassembled cardboard geometrical models showing surfaces of the 2nd order(marked E427 & 427a-1877, 2 parts), Hyperoloid of 2 sheets [Einschaliges Hyperbolid].

Unassembled cardboard geometrical models showing surfaces of the 2nd order

1876
One of seven unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E23a-1901), Ellipsoids of 30 circular sections [ellipsoid II ].

Unassembled cardboard geometrical models; Ellipsoids of 30 circular sections

1901
One of unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E23g-1901), Hyperbolic Paraboloid [Hyperbolisches Paraboloid].

Unassembled cardboard geometrical model showing surfaces of the 2nd order

1901
Assembled cardboard geometrical model on wooden display stand [marked 1876-482] showing surfaces of the 2nd order, Elliptic Paraboloid (marked E22f-1901).

Assembled cardboard geometrical model on wooden display stand

1901
Assembled cardboard geometrical model on wooden display stand [marked 1876-482, not on inventory], showing surfaces of the second order (marked E22c-1901), Hyperboloid of 1 sheet [Einschaliges Hyperbolid].

Assembled cardboard geometrical model on wooden display stand

1901
Unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E429 & 429a-1877, 2 parts),Ellipsoids of 22 circular sections [Ellipsoid I ].

Unassembled cardboard geometrical models showing surfaces of the 2nd order

1876
Unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E430-1877), Cones [Kegel].

Unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E430-1877)

1876
One of seven containing unassembled cardboard geometrical models showing surfaces of the second order (marked E23c-1901), Hyperboloid of 1 sheet [Einschaliges Hyperbolid].

Unassembled cardboard geometrical models; Hyperboloid of 1 sheet

1901
One of seven unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E23d-1901), Hyperoloid of 2 sheets [Zweischaliges Hyperboloid].

Unassembled cardboard geometrical model, Hyperoloid of 2 sheets

1901
One of seven unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E23f-1901), Cones in two sheets [Kegel], only one of two parts present.

Unassembled cardboard geometrical models; Cones in two sheets

1901
One of seven unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E23e-1901), Elliptic Paraboloid.

Unassembled cardboard geometrical model, Elliptic Paraboloid

1901
One of seven unassembled cardboard geometrical models showing surfaces of the 2nd order (marked E23b-1901),Ellipsoids of 22 circular sections [Ellipsoid I ], only one of two parts present.

Unassembled cardboard geometrical models, Ellipsoids of 22 circular sections

1901
Assembled cardboard geometrical model on wooden display stand [marked 1876-482, not on inventory] showing surfaces of the 2nd order, Ellipsoids of 30 circular sections [ellipsoid II ] (marked E22a-1901).

Assembled cardboard geometrical model on wooden display stand

1901
Assembled cardboard geometrical model on wooden display stand [marked 1876-482, not on inventory] showing surfaces of the 2nd order,Ellipsoids of 22 circular sections [Ellipsoid I ] (marked E22b-1901).

Assembled cardboard geometrical model on wooden display stand

1901
Assembled cardboard geometrical model on 2 wooden display stands [marked 1876-482, not on inventory] showing surfaces of the 2nd order (marked E22d & E22e -1901, two parts), Hyperoloid of 2 sheets [Zweischaliges Hyperboloid].

Assembled cardboard geometrical model on 2 wooden display stands

1901
Assembled cardboard geometrical model on 2 wooden display stands [marked 1876-482, not on inventory] showing surfaces of the 2nd order (marked E22g & E22h-1901,two parts), Cones in 2 sheets [Kegel].

Assembled cardboard geometrical model on 2 wooden display stands

1901