-0200 – magnetic compass

The first magnetic compasses were made and used in China around -200. They were probably simple objects made from magnetic lodestone which were crafted so they could turn to orient themselves in a magnetic field. They were used as “devining” tools to reveal hidden knowledge through rituals. Around 700, Chinese inventors began using magnetized needles and by 1000, were suspending them in water. Eventually, it was discovered that they were useful for navigation.

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