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Closest Packing of Rods:
“Just as six balls may be closest packed around a nuclear ball in a plane, six rods or wires may be closest packed around a nuclear rod or wire in a cluster. When the seven wires are thus compacted in a parallel bunch they may be twisted to form a cable of hexagonal cross-section, with the nuclear wire surrounded by the other six. The hexagonal pattern of cross section persists as additional layers may be symmetrically added to the cluster. This demonstrates a circumferentially finite system in universal geometry.”
