‘terrella’ is latin for “little earth,” the name given by william gilbert to a magnetized sphere with which he demonstrated to queen elizabeth i his theory of the earth’s magnetism. By moving a small compass around the terrella and showing that it always pointed north-south, gilbert argued that the same thing, on a vastly larger scale, was happening on earth, and was the only reason why a compass pointed north-south
Our, iron, model earth is wound with copper wire along parallels of latitude. When connected to a battery, on the side bearers with ivory isolations, a magnetic field is formed, wich can be detected by compass and dipping needles. On a beautifull walnut pedestal. 37cm high.