


Model of a cubic surface

Model of a cubic surface

Model of a surface exhibiting double points

Model of a surface whose horizontal sections exhibit double points

Model of a surface exhibiting double points

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

Plaster Surface Model by Alexander Crum Brown, c 1900.
circa 1900

Model of quartic surface

Model of a cubic surface

Model of a surface whose horizontal sections exhibit double points

Three plaster mathematical models of cubic surfaces

Triacontahedron
1876

Model of an ellipsoid c.1935
circa 1935
Mathematical model of a surface with two apices
Plaster model
Four plaster mathematical models of surfaces whose horizontal sections exhibit double points
Set of two plaster mathematical models of surfaces
Icositetrahedron
1876