Tea time question

At the FIM Tea, this afternoon, the observation of the almost-never-erased blackboards in front of the seminar room led to the following historical question of clear importance: when was the blackboard, as a tool for lectures, invented? For instance, did Newton (who was a professor at Cambridge around 1670) ever lecture on a blackboard?

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I am a professor of mathematics at ETH Zürich since 2008.

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