The South Pointing Chariot
The south-pointing chariot device was first invented by the Chinese mechanical engineer Ma Jun (c. 200-265 AD). It was a wheeled vehicle that incorporated an early use of differential gears to operate a fixed figurine that would constantly point south, hence enabling one to accurately measure their directional bearings. This effect was achieved not by magnetics (like in a compass), but through intricate mechanics, the same design that allows equal amounts of torque applied to wheels rotating at different speeds for the modern automobile. After the Three Kingdoms period, the device fell out of use temporarily. However, it was Zu Chongzhi who successfully re-invented it in 478 AD, as described in the texts of the Song Shu (c. 500 AD) and the Nan Chi Shu, with a passage from the latter below:
When Emperor Wu of Liu Song subdued Guanzhong he obtained the south-pointing carriage of Yao Xing, but it was only the shell with no machinery inside. Whenever it moved it had to have a man inside to turn (the figure). In the Sheng-Ming reign period, Gao Di commissioned Zi Zu Chongzhi to reconstruct it according to the ancient rules. He accordingly made new machinery of bronze, which would turn round about without a hitch and indicate the direction with uniformity. Since Ma Jun's time such a thing had not been.
Read more about this topic: Zu Chongzhi
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Famous quotes containing the words chariot, south and/or pointing:
“Every man takes care that his neighbor shall not cheat him. But a day comes when he begins to care that he does not cheat his neighbor. Then all goes well. He has changed his marketcare into a chariot of the sun. What a day dawns, when we have taken to heart the doctrine of faith!”
—Ralph Waldo Emerson (18031882)
“In the far South the sun of autumn is passing
Like Walt Whitman walking along a ruddy shore.
He is singing and chanting the things that are part of him,
The worlds that were and will be, death and day.
Nothing is final, he chants. No man shall see the end.
His beard is of fire and his staff is a leaping flame.”
—Wallace Stevens (18791955)
“And pointing to his disciples, he said, Here are my mother and my brothers!”
—Bible: New Testament, Matthew 12:49.