Atlantic Codex (Codex Atlanticus), f. 1069 recto, Leonardo da Vinci, circa 1482

Left: a device for breathing under water; machines that raise and pump water; at the top right: two devices intended to draw the water of a river; on the left below: a bucket with a siphon. Date: circa 1482. Medium: ink and wash on paper, pen. Collection: Gallerie dell'Accademia. Codex Atlanticus f1069 recto