The Four New InventionsPPT
The CompassThe compass, a device that revolutionized navigation, was invented...
The CompassThe compass, a device that revolutionized navigation, was invented in China during the Song Dynasty (960-1279). Originally used for navigation, the compass later became an essential tool for surveying and construction.The compass uses magnetic needle to indicate the direction of the Earth's magnetic field. When the needle is allowed to rotate freely, it settles at an angle that corresponds to the direction of the magnetic field. This allows sailors and explorers to determine their bearings accurately, even when they are far away from landmarks or other visible cues.GunpowderGunpowder, a mixture of saltpeter, sulfur, and charcoal, was first invented in China during the Tang Dynasty (618-907). It was initially used for medical purposes and as a weapon in fireworks displays. However, it later became a crucial military asset and was used in the development of firearms and cannons.Gunpowder's explosive properties make it a powerful weapon. When ignited, it generates a large amount of gas and heat, which propels a projectile forward. This allows for accurate long-range attacks and the ability to penetrate armor. As a result, gunpowder revolutionized warfare and gave rise to new military strategies and technologies.PaperPaper, a versatile and inexpensive material for writing, printing, and packaging, was invented in China during the Han Dynasty (202 BC-220 AD). It was first made from mulberry bark, but later evolved to use a variety of fibers, including wood, grass, and even recycled cloth.Paper's durability and ease of use made it an ideal material for writing and printing. It allowed for the production of books and newspapers on a large scale, as well as for the dissemination of knowledge and culture. Furthermore, paper provided a platform for art and creativity, as people used it to create sketches, paintings, and other forms of visual expression.Printing PressThe printing press, which revolutionized communication and information dissemination, was invented by Johannes Gutenberg in Germany during the 15th century. It allowed for the mass production of books and documents through the use of movable type.The printing press uses ink and pressure to transfer text and images onto a printing surface. By arranging the letters and words on a page, it made possible the production of books and documents at a much faster rate and on a larger scale. This led to an increase in literacy rates and a broadening of access to knowledge. The printing press also enabled the dissemination of ideas and opinions, as it allowed for the printing of newspapers, pamphlets, and other forms of printed media.
