By Herbert W. Meyer
Written as a way to be understood by way of the non-technical reader who's fascinated by the starting place of the entire electric and electromagnetic units that encompass him, this heritage additionally offers a handy compendium of knowledge for these acquainted with and magnetic fields. The e-book strikes alongside at a speedy velocity, because it needs to whether it is to hide the large proliferation of advancements that experience happened over the last hundred years or so. the writer has struck a viable stability among the human facet of his tale, introducing these biographical information that aid improve it, and its technical facet, explaining theories and "how issues paintings" the place this turns out applicable. He additionally achieves a stability in recounting the invention of easy medical ideas and their technological applications—the myriad of units and innovations that make the most of power and knowledge in electromagnetic shape. certainly, one of many very important subject matters of the ebook is the shut and reciprocal dating among technology and know-how, among concept and perform. prior to nearly 1840, the in basic terms clinical investigations of electric and magnetic phenomena have been principally advert hoc and observational, and primarily no expertise in response to them existed. Afterwards, the medical explorations turned extra programmatic and mathematical, and technical purposes and innovations started to be produced in nice abundance. In go back, this expertise paid its debt to natural technology through supplying it with a chain of measuring tools and different study units that allowed it to increase in parallel. even though this booklet studies the early discoveries, from the magnetic lodestone and electrostatic amber of antiquity to Galvani's frog's legs and Franklin's kite-and-key of the 1700s, its significant emphasis is at the post-1840 advancements, because the following bankruptcy titles will ascertain: Early Discoveries—Electrical Machines and Experiments with Static Electricity—Voltaic electrical energy, Electrochemistry, Electromagnetism, Galvanometers, Ampere, Biot and Savart, Ohm—Faraday and Henry—Direct present Dynamos and Motors—Improvements in Batteries, Electrostatic Machines, and different Older Devices—Electrical tools, legislation, and Definitions of Units—The electrical Telegraph—The Atlantic Cable—The Telephone—Electric Lighting—Alternating Currents—Electric Traction—Electromagnetic Waves, Radio, Facsimile, and Television—Microwaves, Radar, Radio Relay, Coaxial Cable, Computers—Plasmas, Masers, Lasers, gas Cells, Piezoelectric Crystals, Transistors—X-Rays, Radioactivity, Photoelectric impact, constitution of the Atom, Spectra.
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Extra resources for A History of Electricity and Magnetism
Up to that time a11 known electrical phenomena originated solely from electrical charges produced by friction, heat, or induction, and currents of electricity were of a transitory nature, resulting from the discharges of accumulated electrical charges. In the period now under consideration, new contrivances were discovered which were capable of producing, by chemical means, steady currents of electricity. The quantities of electricity available from the various electrical machines previously in use were minute, and therefore the chemical, heating, and magnetic effects were difficult to observe, although a11 of them, as a matter of fact, had been noted.
This book of 736 pages was published in 1767, and notwithstanding the fact that electrical science had scarcely been born at this time the book is still well worth reading. Priestley made only minor contributions to electrical science, among them the fact that carbon was a conductor, yet he showed a remarkable insight into the nature of electrical phenomena and predicted that new developments in t h e art would far outstrip anything that had SO far been conçeived. He could hardly bave dreamed of the magnificent fulfillmcnt o f h i s p r o p h e c y .
Following the work of Gray and Du Fay on the transmission of electricity, the idea of using electricity for telegraphic purposes occurred to a number of men. Before the discovery of voltaic electricity and electromagnetism the kinds of signais were limited in number. Winckler probably used sparks. Pierre Lemonnier of France discovered that the quantity of electricity communicated to a body is not in proportion to its volume but in proportion to its surface. He also discovered that the shape of a body influenced its ability to receive a charge.
A History of Electricity and Magnetism by Herbert W. Meyer