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Model of a geometrical surface

Plaster Surface Model by Alexander Crum Brown, c 1900.

circa 1900

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

circa 1900

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

circa 1891

Model of a cubic surface

Model of a cubic 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 cubic surface

Model of quartic surface

Model of an ellipsoid c.1935

circa 1935

Model of a surface whose horizontal sections exhibit double points

Triacontahedron

1876

Three plaster mathematical models of cubic surfaces

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

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

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

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