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SpiroGraph v2.0

This device consists of the studded disc, located inside the toothed circle. In the disk there is a small hole situated a certain distance from its centre. The tip of the pencil is put into this hole. The disk is then moved so that it always in contact with the circumference, teeth of which guarantee no slippage occurs. The pencil plots the cycloid, which is considered drawn as soon as pencil returns to the starting point.

Download dg_spiro.ms.