Beaufort scale

“Today we have a force 5 wind”. Great, but what does that mean? Translation: "Hoist high sailors, we have a good breeze and a wind of about 20 knots" With this poster, you will always have in mind the conversions between the Beaufort scale and the wind speed in Km / h and Knots. Created in 1805 by British Admiral Francis Beaufort (1774-1857), the Beaufort scale measures the force of the wind in 13 degrees, from force 0 (Calm) to force 12 (Hurricane). Beaufort degree corresponds to the state of the sea as a function of the wind speed. You can mix the posters in the same order :)