Four Great Inventions of Ancient China -- Compass - 0 views
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Niamh McGurk on 03 Jun 12Early in the Spring and Autumn Period (770-476BC), while mining ores and melting copper and iron, Chinese people chanced upon a natural magnetite that attracted iron and pointed fixedly north. In the Warring States Period (206BC-23AD), after constant improvement the round compass came into being.