sir plz give me ppt of modification of automobile...
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The early history of the automobile can be divided into a number of eras, based on the prevalent means of propulsion. Later periods were defined by trends in exterior styling, size, and utility preferences.
In 1768, the first steam-powered automobile capable of human transportation was built by Nicolas-Joseph Cugnot.
In 1807, François Isaac de Rivaz designed the first car powered by an internal combustion engine fueled by hydrogen.
In 1864, Siegfried Marcus created the first gasoline powered combustion engine, which he placed on a pushcart. An Austrian inventor of Jewish descent, Marcus created the two-cycle combustion engine. The car's second incarnation, debuting in 1880, introduced innovations such as a four-cycle, gasoline-powered engine, an ingenious carburetor design, and magneto ignition. He created an additional two models further refining his design with steering, a clutch and brakes. His second car can be seen on display at the Technical Museum in Vienna. During his lifetime, he was widely considered (and formally honored as) the originator of the motorcar. But his place in history was all but erased by the Nazis during World War II. Because Marcus was of Jewish descent, the Nazi propaganda office ordered his work to be destroyed, his name expunged from future textbooks, and his public memorials removed. They largely succeeded in favor of Karl Benz, but it cannot be denied that this ahead-of-his-time engineer and inventor built four progressively sophisticated combustion-engine cars over a 10-to-15-year span, and many of his inventions have found their way into the cars of today.
In 1886, Karl Benz developed a petrol- or gasoline-powered automobile. This is also considered to be the first "production" vehicle as Benz made several other identical copies.
At the turn of the 20th century electrically powered automobiles appeared but only occupied a niche market until the turn of the 21st century.