when was the magnetic compass invented

Invention of the magnetic compass
Magnetic Compass - WH 15 SEM 1 Medieval Magnetic Compass Was Invented In History of Compass - Who Invented Compass? Early Chinese Compass – 400 BC - MagLab How a flawed and unreliable invention A history of the magnetic compass – BHP The early history of transportation Ancient china The South Pointing Spoon | Hakai Magazine Compass - Wikipedia History of Magnetic Compass - Invention How Does a Compass Work - Universe Today Who Invented the Magnetic Compass Brass Compass. Iranian, 1800-75. The Ancient China by Wendy Huang Compass and Other Magnetic Innovations Invention Of The Magnetic Compass Compass | navigational instrument Chinese History timeline | Timetoast The Magnetic Compass Compass | navigational instrument Compass - Wikipedia Surprising Ancient Chinese Inventions Invention of the Magnetic Compass Who invented the compass? Navigate the Compass | navigational instrument US4175333A - Magnetic compass | Patent History of the compass - Wikipedia First invented magnetic compass box to Brass Compass. Iranian, 1800-75. The Compass - Wikipedia When was the first compass invented and History of the compass - Wikipedia

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