Ancient mariners used to gauge how fast their ship was moving by throwing a piece of wood or other floatable object over the vessel’s bow then counting the amount of time that elapsed before its stern passed the object. This method was known as a Dutchman’s log. By the late 16th century, sailors had begun using a chip log to measure speed. In this method, knots were tied at uniform intervals in a length of rope and then one end of the rope, with a pie-slice-shape piece of wood (or “chip”) attached to it, was tossed behind the ship. As the vessel moved forward, the line of rope was allowed to roll out freely for a specific amount of time, which was typically tabulated with an hourglass. Afterward, the number of knots that had gone over the ship’s stern was counted and used in calculating the vessel’s rate of speed. A knot came to mean one nautical mile per hour. Therefore, a ship traveling at 15 knots could go 15 nautical miles per hour.
For a number of years, there was disagreement among various nations about the exact measurement of a nautical mile, which is based on the Earth’s circumference. In 1929, the international nautical mile was standardized at 6,076 feet; it was adopted by the United States in 1954. A nautical mile is different from a mile on land, which is based on walking distance. The Romans first defined a land mile as 1,000 paces or pairs of steps; it was set at its current measurement of 5,280 feet by Queen Elizabeth I in 1593.
Get link
Facebook
X
Pinterest
Email
Other Apps
Comments
Popular posts from this blog
-
From wiki...............the skins won in 1937 and 1942......................... The Redskins won the 1937 and 1942 Championship games, as well as Super Bowls XVII , XXII , and XXVI . They also played in, and lost, the 1936 , 1940 , 1943 , and 1945 Championship games, as well as Super Bowls VII and XVIII . They have made 22 postseason appearances, and have an overall postseason record of 23 wins and 17 losses
From wiki..........about a Tom Clancy novel................. Simultaneously, the Soviets seize Iceland in a covert surprise attack with the Soviet merchant ship Julius Fucik disguised as a Lykes Lines American LASH ship , capturing the NATO air station at Keflavík and eliminating the GIUK - SOSUS line to allow the Soviet Navy to surge its submarines into the Atlantic Ocean without being detected. In addition, the Soviet Navy takes steps to protect its ballistic missile submarine fleet in coastal waters behind minefields and ASW assets, freeing up its attack submarines to engage and destroy NATO shipping. Thus, the Soviet Navy is able to act as an offensive weapon contrary to pre-war NATO expectations, becoming a major strategic threat against resupply convoys coming from North America with both aircraft and submarines. This advantage is put to immediate use as a NATO carrier battle ...
Right between Arlington National Cemetery.........and the Iwo Jima Memorial..........North and South of each other..........a country divided?? Complete with Egyptian themes......Mt. Vernon is also in Virginia......just down the Potomac river a bit...............George Washington's estate........he is on our 1 dollar bill........with an Egyptian pyramid with an eye on top of it on the back.............a very tall flag pole...............in front of Rob E Lee's house.......dominating the entire area...........the South over everyone ........white power is what they are really saying..............the Dutch are in Europe......White people............. Netherlands Carillon From Wikipedia, the free encyclopedia Jump to navigation Jump to search Coordinates : 38.8882°N 77.0695°W The Carillon viewed from the northwest The Netherlands Carillon adjacent to Arlington National Cemetery was a gift from the people of the Netherlands to the people of the...
Comments
Post a Comment