English 
boat speedometer paddle wheel
Paddle boats are also called vehicles and boats. They are equipped with paddle wheels with paddles on the side or tail of the ship, and manually step on the paddle axle to make the paddles around the wheel paddle water and push the hull forward. Because the lower part of the paddle wheel of this kind of ship is submerged in the water, and the upper part is exposed to the water, it is also called "Ming ship", so as to distinguish it from wooden boats with manual paddles and wind-driven sailboats.
One knot = one nautical mile / hour = 1.852 km / hour
[knots]: it is a unit of ship's sailing speed. Later, it was also used for the speed of wind and ocean current.The code of "knot" is English "knot", which refers to the length of 1 minute of latitude on the meridian of the earth. Because the earth is slightly ellipsoidal, the 1 minute radian at different latitudes is slightly different. On the equator, one nautical mile is about 1843 meters; At 45 ° latitude, it is about 1852.2 meters, and the two poles are about 1861.6 meters. In 1929, the international Hydrogeography conference adopted 1 minute average length of 1852 meters as 1 nautical mile; In 1948, the International Conference on safety of life recognized that 1852 meters or 6o76.115 feet is 1 nautical mile, so 1852 meters is internationally adopted as the standard nautical mile length. China recognizes this standard with the code "m".
The origin of the boat:
The word "ship" began in the Tang Dynasty, and its emergence is related to the reform of ship power.It turned out that Li Gao of the Tang Dynasty invented the "paddle ship". He installed a paddle wheel with paddles on the side or stern of the ship, and manually stepped on the paddle shaft to make the paddles on the circumference of the wheel pull water and push the hull forward. Because the lower part of the paddle wheel of this kind of ship is immersed in the water, and the upper part is exposed to the water, it is called "Ming ship" or "ship", so as to distinguish it from the wooden boat with manual paddle and the wind driven sailboat.The French inventor Geoffrey was the first to build the steam ship. In 1769, he built the world's first steam ship "piros CAFI", which was started by a steam engine. Later, the British shermington also built a steam ship in 1802. Unfortunately, they have not been applied in practice.It was not until September 1807 that the steamship "Claremont", designed and manufactured by Fulton, an American, was successfully piloted that the steamship began to truly succeed as the protagonist on the water stage. The "Claremont" is 45.72 meters long, 9.14 meters wide, with a displacement of 100 tons and a speed of 6.4 kilometers per hour.After the invention of the steam engine ship, it has been used for more than 100 years to drive the paddle wheel with the steam engine as the power instead of human power.
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