[ljosa]

Thomas Jefferson "carried a small notebook made up of ivory leaves on which to record his observations. He would write down his measurements in pencil and in the evening transfer the data to seven large notebooks, each devoted to a different subject. He would then erase the ivory plates, readying them for another day of scientific inquiry." Source: https://www.artofmanliness.com/2010/09/13/the-pocket-noteboo...