Plaster Surface Model by Alexander Crum Brown, c 1900.

Image number: 10314747

Plaster Surface Model by Alexander Crum Brown, c 1900.

Alexander Crum Brown (1838-1922), mathematician and chemist, was professor of mathematics at Edinburgh University and a prolific maker of mathematical models. This surface represents the equation: z=3a(x squared - y squared) - (x cubed + y cubed). Every section made by a plane passing through the blue line and cutting the surface is an ellipse.

Image number:
10314747
Credit:
Science Museum/Science & Society Picture Library
Date taken:
20 October 2003 14:40
Image rights:
Science Museum