The History And Present State Of Electricity
(Joseph priestley)
A Presbyterian minister Joseph Priestley, one of the greatest inventor of all times had donned the role of a historian and presented the world the first history of science The history of electricity. It was published in the year 1767 and contained all knowledge available on electricity unto that period. The versatile author of the book, who was also authority on law, physics, chemistry, religion as well as a mastermind behind early electrical investigations argued that writing history of scientific discoveries were important as it showed how human intelligence discovered and directed the forces of nature. Of the important subjects discussed in the book one was the phenomenon of capacitance invented by the Dutch physicist Pieter van Musschenbroek the discoverer of first capacitor with due importance. The important discovery known as Leyden Jar which could store the electricity was the first capacitor developed. Inspired by this finding In 1747 Franklin began his electrical experiments. He supported the hypothesis behind Leyden Jar and proposed that lightning is an electrical phenomenon. He also framed and publicized a plan for an effective demonstration of this fact; his celebrated experiment with the kite in 1752. He invented the lightning rod and offered what is called the "one-fluid" theory in explanation of the two kinds of electricity, positive and negative. The book records some of the important findings on dissipation of electric charge and electrical resistance deduced from the writers own experiments. Joseph suggested that the force caused by electricity was likely to follow a mathematical relationship called the ?Inverse-square law?. Using this idea, Coulomb made quantitative measurements of the force of attraction and repulsion between charged objects. The equation for this effect is now known as Coulomb's law and the unit of measurement of charge as the Coulomb. He also explained the formation of rings when a electric body is discharged now known as priestly rings. The most significant contribution of the book is that it created awareness about the vast potential of the electric force amongst scientific community and made them feel that electrical theory can become an exact science.
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