so, I found the original diagrams Mortis Ghost used for the OFF elements, it's from "Larousse universel en 2 volumes: nouveau dictionnaire encyclopedique" (link below)
you can read here (warning for slight nudity, though it is not extremely prevalent:
2 volumes : 31 cm
some of the screenshots used here were taken from this video (credit): https://www.youtube.com/watch?v=4if4qlmKjEw














