technology+in+1450

The printing press was invented in 1439 by a german called johonnes gutenberg in germany. In the 16th century there were 31 published books, in the 17th century there were 164 books published and in the 18th century there were 824. the first house of printing in america was established in 1771 in vagharshapat and the first book was called friday book. In olmec mexico dating roughly 1000bc an ancient hematite artifact was discovered. the olmecs did not have iron which the chinese discovered would magnetize by contact with lodestone. by the han dynasty (202 bc - 220 ad) the chinese started using lodestone caddle and bowl shaped compasses for divination and geomancy but not yet for navigation. later in the year 1119 zhu yu was the first to mention the compass needle being used for navigation out in see the worl and find out where their going.