


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

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 a Half-Twist Surface 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

Triacontahedron
1876

Model of an ellipsoid c.1935
circa 1935

Three plaster mathematical models of cubic surfaces
Mathematical model of a surface with two apices
Icositetrahedron
1876