Thomas Jefferson’s Notebooks


 

Before paper became such a common commodity, people would use various instruments to take notes on. Thomas Jefferson, for instance, used ivory plates to record numbers and memos on as he took measurements with his pocket instruments. He would write scientific observations, notes, or finances down in pencil, and then recopy any valuable information on a more permanent medium. He could then erase any pencil markings off the plates and reuse them again.

(via TYWKIWDBI)

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