The invention of the internal combustion engine is another major achievement of applied technology in the second industrial revolution. In 1876, the German Otto built the first four-stroke internal combustion engine powered by gas, which became a popular small power engine. In 1883, German engineer Daimler developed an internal combustion engine that used gasoline as fuel. It had the characteristics of high horsepower, light weight, small size, and high efficiency, and could be used as a vehicle engine. In 1885, German mechanical engineer Carl Benz built the first car, and Benz was called the "Father of the Automobile." This easy-to-start car has three wheels, rotates about 250 times per minute, and has a speed of about 15 kilometers per hour. It has a water-cooled single-cylinder engine with a power of 3/4 horsepower and is ignited by electricity. This car enabled Benz to obtain the first automobile patent. Then, German engineer Diesel invented an internal combustion engine with a simpler structure and cheaper fuel in 1897 - the diesel engine. Although this diesel engine is heavier than the internal combustion engine using gasoline, it is very suitable for heavy-duty transportation. It is used not only in ship engines, but also in train locomotives and trucks. As a new means of transportation, cars powered by internal combustion engines are also developing rapidly. In the 1890s, only a few thousand cars were produced every year in various countries around the world, but by the eve of World War I, the world's annual car production had soared to more than 500,000 cars. The invention and use of the internal combustion engine also promoted the development of the oil extraction industry and accelerated the emergence of the petrochemical industry. In 1859, on the eve of the Civil War, oil was discovered in Pennsylvania and the first oil well was drilled, but the oil was initially only used for lighting. With the widespread application of internal combustion engines, the demand for fuel oil has skyrocketed. People have begun to mine and refine oil in large quantities, and oil production has grown rapidly.