Plaster Surface Model by Alexander Crum Brown, c 1900.

 
Plaster Surface Model by Alexander Crum Brown, c 1900.
4 0 c m
 
33cm
actual image size: 25cm x 32cm

Description

Alexander Crum Brown (1838-1922), mathematician and chemist, was profesor 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 pasing through the blue line and cutting the surface is an ellipse.

© Science Museum / Science & Society Picture Library

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