Before revision: However, the later written Song Shu (Book of Song) (6th century) recorded the south-pointing chariot's design and use in further detail, as well as creating the background legend of the device's (supposed) use long before Ma's time, in the Western Zhou Dynasty (1050–771 BC).
After revision: However, the later written Song Shu (Book of Song) (6th century) recorded the south-pointing chariot's design and use in further detail, as well as creating the background legend of the device's (supposed) use long before Ma's time, in the Western Zhou dynasty (1050–771 BC).