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Starley, then aging, found it difficult to ride a tricycle sociable with his son, James, in the other saddle. They could not steer because one was stronger than the other. The historian Edward Lyte wrote: "Each rider of the sociable drove his own big wheel independently, so the course of the machine along the road was rather variable. One day Starley cried 'I have it!' and dismounted. He sat down to a cup of tea and forthwith invented the differential gear, an important

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