What lurks in the water!
The history of the submarine and it's inventor.
The first submarine was build in 1898 by John Holland and was named after his last name. He first tried to submit his plans to the U.S Navy but it was rejected. The Fenian society wanted to take down the British navel and funded money to john's invention. He was able to make two submarines and it was a complete success. The U.S navel was interested and had asked John to submit his plans on the submarine. 7 years later he finally build a sub for them but it failed because they took out some of his ideas. John went to prove he was right and launched one secretly. In success the U.S Navy asked for him to build them his way and now the electric boat of general dynamics corporation has continued to build the U.S Navy's submarines.
The older invention of the submarine
How the submarine works and why?
The submarine can float because of the weight of the water is equal to the weight of the boat. The displacement of water is called buoyant force. Unlike ships a sub can control it's buoyancy to go sink or surface. To do this the sub has ballast tanks and auxiliary that can be filled with air of water. When the submarine is at the surface they fill the tanks with air and the density of the sub is less than the surrounding water. When it dives the tanks are filled with water and the density is greater than than surrounding water. The sub has conduced air for life support so the crew may breath. The submarine has wings on it that are called hydroplanes. These wings are located at the stern (back) which helps the angle to dive. The wings are in an angle that help the water pass of the stern which points the stern upward so that the sub is going down.