【摘要】 讨论了指南针的发明年代问题，指出了将指南针发明年代确定为９～１０世纪所根据的文献资料是不可靠的．要把指南针发明年代从１１世纪往前推，还必须寻找更可靠的文献资料更多还原

【Abstract】 The invention time of magnetic needle is discussed. It is pointed out that the literatures which some people based to assert that magnetic needle was invented in 9 or 10 centuries are not reliable.更多还原