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6 gen 1119 anni - The use of the Magnetic Compass.

Descrizione:

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.

Aggiunto al nastro di tempo:

Song Dynasty

ByAidan Steigelmann
29 gen 2018

Data:

6 gen 1119 anni
Adesso
~ 905 years ago
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