Year	1801	1804	1807	1816	1842
Personality	Alessandro volta	Richard Trevithick	Denis Papin, James watt and Thomas Newcomen	Nicéphore Niepce	Crawford Williamson Long
Invention	Electric battery	Steam locomotive	Steamboat	Photography	Anesthesia
Description	It consisted in a series of a couple of zinc discs and copper (stacked) or also silver discs separated from each other by pieces of cardboard impregnated With water and salt. Each one of these pairs supplied 0.75 v. Then it started the electric age we live in.	A steam locomotive is a locomotive powered by a steam engine. The term usually refers to its use on railways, but can also refer to a "road locomotive" such as a traction engine or steamroller.	A steamboat or steamship, sometimes called a steamer, is a ship in which the primary method of propulsion is steam power, typically driving propellers or paddlewheels. It was developed principally by Denis papin who desingned a boat moved for steam.	The fhotography was born in france.  In 1816 Niepce gets a negative first picture imperfect and unstable with a dark camera. In 1833 Niepse died and Daguerre continuous until get a reliable procedure and commercial. The system consists on the obtaining of picture over surface of polished silver.	Since the beginning of the science we have searched a way to eliminate the pain. So by the year of 1842 march in Danielsville, Georgia, the doctor Crawford was the first who used anesthesia like ethyl ether during a operation, by the time he supplied a child before to remove him a cyst in the neck.
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