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Model of a Half-Twist Surface by Alexander Crum Brown, c 1900.

Model of a Half-Twist Surface by Alexander Crum Brown, c 1900.

1900

Plaster Surface Model by Alexander Crum Brown, c 1900.

Plaster Surface Model by Alexander Crum Brown, c 1900.

circa 1900

Three plaster mathematical models of cubic surfaces

Three plaster mathematical models of cubic surfaces

Model of quartic surface

Model of quartic surface

Triacontahedron

Triacontahedron

1876

Model of a cubic surface

Model of a cubic surface

Model of a cubic surface

Model of a cubic surface

Model of a cubic surface

Model of a cubic surface

Model of a geometrical surface

Model of a geometrical surface

Model of a surface exhibiting double points

Model of a surface exhibiting double points

Model of a surface whose horizontal sections exhibit double points

Model of a surface whose horizontal sections exhibit double points

Plaster model of the surface 2xyz=x squared -y squared-z squared +1=0 according to Prof Allardice

Plaster model of the surface 2xyz=x squared -y squared-z squared +1=0 according to Prof Allardice

circa 1891

Model of a surface whose horizontal sections exhibit double points

Model of a surface whose horizontal sections exhibit double points

Model of an ellipsoid c.1935

Model of an ellipsoid c.1935

circa 1935

Model of a surface exhibiting double points

Model of a surface exhibiting double points

Four plaster mathematical models of surfaces whose horizontal sections exhibit double points

Four plaster mathematical models of surfaces whose horizontal sections exhibit double points

Mathematical model of a geometrical surface with two apices, whose equation, referred to a suitable system of co-ordinates, may be written (x-p/a1)2 = 1/k6(c-y)3 (c+y), where p=1/f (c-y0 (c+y), q=1/g3(c-y)(c+y) and a,b,c,f,g & k are all constants.

Mathematical model of a surface with two apices

Set of two plaster mathematical models of surfaces showing projections of their sections onto a horizontal plane

Set of two plaster mathematical models of surfaces

Plaster model of the surface 2z = a2(x2 + 3y2) - (x4 + 6x2y2 + y4)

Plaster model

Catalan collection of semi-regular polyhedra: icotetrahedron, in plaster

Icositetrahedron

1876