高中英语 Unit4 Public transport文化背景 牛津译林版选修7-牛津版高二选修7英语素材

Unit4 Public transport 文化背景The History of AutomobileThe automobile as we know it was not invented in a single day by a single inventor. The history of the automobile reflects an evolution that took place worldwide. It is estimated that over 100,000 patents created the modern automobile. However, we can point to the many firsts that occurred along the way. Starting with the first theoretical plans for a motor vehicle that had been drawn up by both Leonardo da Vinci and Isaac Newton.In 1769, the very first self-propelled(机动式的) road vehicle was a military tractor(军用牵引车) invented by French engineer and mechanic, Nicolas Joseph Cugnot (1725 - 1804). Cugnot used a s team engine to power his vehicle, built under his instructions at the Paris Arsenal by mechanic Brezin. It was used by the French Army to haul artillery(炮) at a whopping speed of 2 1/2 mph on only three wheels. The vehicle had to stop every ten to fifteen minutes to build up steam power. The steam engine and boiler were separate from the rest of the vehicle and placed in the front (see engravi ng above). The following year (1770), Cugnot built a steam-powered tricycle that carried four passengers.In 1771, Cugnot drove one of his road vehicles into a stone wall, making Cugnot the first person to get into a motor vehicle accident. This was the beginning of bad luck for the inventor. After one of Cugnot's patro ns(赞助人) died and the other was exiled, the money for Cugnot's road vehicle experiments ended.Steam engines powered cars by burning fuel that heated water in a boiler, creating steam that expanded and pushed pistons that turned the crankshaft(机轴), which then turned the wheels. During the early hist ory of self-propelled vehicles—both road and railroad vehicles were being developed with steam engines. (Cugnot also designed two steam locomotives with engines that never worked well.) Steam engines added so much weight to a vehicle that they proved a poor design for road vehicles; however, steam engines were very successfully used in locomotives. Historians, who accept that early steam-powered road vehicles were automobiles, feel that Nicolas Cugnot was the inventor of the first automobile.