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Orrery

This orrery shows the sun, the earth and the moon. It was built from a Model of the Month in Meccano Magazine June 1957.

Electrical connections, showing power through the structure, and picked up from a wiper arm touching the ring (made of channel segments).

Polystyrene balls bought from the London Graphics Centre in Covent Garden - they have a good selection of sizes, cheap and available singly.