Benjamin Franklin And His Contributions - think, that
Chances are most people know Benjamin Franklin either as a Founding Father of the United States or a discoverer of Electricity with a key connected to a kite. Less known was that he travelled to Liverpool with his son and one of his slaves, spending several days here in Franklin lived in Britain during three periods of his life, firstly in the capacity of his trade as a printer and then in his role as a colonial envoy. The United States was still a colony of Great Britain. Franklin was born in Boston, Massachusetts on 17th January , one of seventeen children. His brother James was a printer and at the age of 12 Benjamin became his apprentice and learnt the trade. Three years later James founded the first truly international newspaper in the colonies, the New-England Courant. At the age of 17 Benjamin absconded from his apprenticeship and ran away to Philadelphia where he worked at several print shops. Benjamin Franklin And His Contributions.
The history of electromagnetic theory begins with ancient measures to understand atmospheric electricityin particular lightning.
In the 19th century it had become clear that electricity and magnetism were related, and their theories were unified: wherever charges are in motion electric current results, and magnetism is due to electric current. The knowledge of static electricity dates back to the earliest civilizations, but for millennia it remained merely an interesting and mystifying phenomenon, without a theory to explain its behavior and often confused with magnetism. Amber, when rubbed, attracts lightweight objects, such as feathers; magnetic iron ore has the power of attracting iron. If true, this "predates the Chinese discovery of the geomagnetic lodestone compass by more than a Benjamin Franklin And His Contributions.
Long before any knowledge of electromagnetism existed, people were aware of the effects of electricity. Lightning and other manifestations of electricity such as St.
Franklin in Britain
Elmo's fire were known in ancient times, but it was not understood that these phenomena had a common origin. Thales wrote on the effect now known as static electricity. The Greeks noted that if they rubbed the amber for long Benjamin Franklin And His Contributions they could even get an electric spark to jump. The electrostatic phenomena was again reported millennia later by Roman and Arabic naturalists and physicians. Pliny in his books writes: "The ancient Tuscans by their learning hold that there are nine gods that send forth lightning and those of eleven sorts. A number of objects found in Iraq in dated to the early centuries AD Sassanid Mesopotamiacalled the Baghdad Batteryresembles a galvanic cell and is believed by some to have been used for electroplating.
As a result, the nature of these objects is based on speculationand the function of these artifacts remains in doubt. Magnetic attraction was once accounted for by Aristotle and Thales as the working of a soul in the stone.
The Benjamin Franklin
In the 11th century, the Chinese scientist Shen Kuo — was the first person to write of the magnetic needle compass and that it improved the accuracy of navigation by employing the astronomical concept of true north Dream Pool Essays, and by the 12th century the Chinese were known to use the lodestone compass for navigation.
InAlexander Neckam was the first in Europe Bejjamin describe the compass and its use for navigation.
In the thirteenth century Peter Peregrinusa native of Maricourt in Picardymade a discovery of fundamental importance.]
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