During the Renaissance/Enlightenment, there was a lot of discussion among intellectuals on how to best keep notebooks/journals. A widely used system was to carry a small pocket notebook which was filled logbook style, with things entered as they came up. The material from the pocket notebook would later be transcribed to topically arranged journals. I believe I've read reference to this practice going back to Classical times. Given the frequent discussion of jornaling on HN, I'm surprised at the lack of discussion of this method.