Comprises of a set of four transparent plastic plates 153 x 76 x 6 mm, each plate has a matrix of 98 (14 x 7) small circular chambers. Each chamber containing an iron rod functioning effectively as a plottingcompass. The plates may be arranged in various ways, e.g. as a single large two dimensional surface, as faces of a cube etc. This way may be used to show configuration of a magnetic field in one or two dimensions. The transparent nature of the plates also makes them suitable for use on an overhead projector.
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