Description
18th April 1953
The Poor Man's Friend'
Inscribed in ink: 'Capsicum fructu rugoso maximo plerumque nutatnte Rand n
Map with geological information shown in colours and a vertical scale in the bottom margin
A terrella tiled 18th April 1953A terrella ('little earth') is a sphere made of a magnetized substance, used to simulate the magnetic field of the earth. In the 16th century the English physician William Gilbert used a terrella made out of lodestone (a naturally occurring magnetized mineral) to demonstrate that the earth is magnetic, and to explain how mariner's compasses work. 17th century
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