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6 janv. 1119 - The use of the Magnetic Compass.

Description:

These were the first reports of the Song Dynasty using a magnetic compass. The compass is different because it uses a smaller needle which is attached to a fixed stem. This is important when the Song travel in the Ocean.

Ajouté au bande de temps:

Song Dynasty

ByAidan Steigelmann
29 janv. 2018

Date:

6 janv. 1119
Maintenaint
~ Il y a 905 ans
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