Download A History of Electricity and Magnetism by Herbert W. Meyer PDF

By Herbert W. Meyer

ISBN-10: 026213070X

ISBN-13: 9780262130707

Written with a purpose to be understood by means of the non-technical reader who's desirous about the beginning of all of the electric and electromagnetic units that encompass him, this historical past additionally presents a handy compendium of data for these accustomed to and magnetic fields. The ebook strikes alongside at a quick speed, because it needs to whether it is to hide the big proliferation of advancements that experience happened over the past hundred years or so. the writer has struck a possible stability among the human part of his tale, introducing these biographical info that support boost it, and its technical facet, explaining theories and "how issues paintings" the place this turns out acceptable. He additionally achieves a stability in recounting the invention of easy clinical rules and their technological applications—the myriad of units and innovations that make the most of power and data in electromagnetic shape. certainly, one of many vital subject matters of the e-book is the shut and reciprocal courting among technology and know-how, among idea and perform. ahead of nearly 1840, the in simple terms clinical investigations of electric and magnetic phenomena have been principally advert hoc and observational, and basically 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 know-how paid its debt to natural technological know-how via delivering it with a chain of measuring tools and different learn units that allowed it to improve in parallel. even though this e-book reports 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 make sure: 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, gasoline Cells, Piezoelectric Crystals, Transistors—X-Rays, Radioactivity, Photoelectric impression, constitution of the Atom, Spectra.

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Extra resources for A History of Electricity and Magnetism

Example text

Berzelius of Gotland, Sweden, between the years 1802 and 1806, published a number of important papers on his electrochemical researches. These papers undoubtedly laid the foundation for the brilliant series of electrochemical discoveries by Davy. On November 20, 1806, Davy delivered his first Bakerian lecture before the Royal Society, on the subject, “On Some Chemical Agencies of Electricity,” and thereby provided the basis for the ionization theory. Then followed that notable series of discoveries in which Davy isolated sodium and potassium in 1807 and barium, boron, calcium, and strontium in 1808.

Wben the vessels were shaken, the light appeared in the evacuated vessels but only faintly in those containing air. Thc appearancc of tbe light was also different in the 14 Chapter Two exhausted vessels from that in the vessels containing air. In the vacuum the light was in the nature of a glow that permeated the evacuated space, whereas in the vessels containing air the light appeared as weak flashes. Hawksbee discovered that similar effects could be produced on glass vessels,without mercury simply by rubbing the exterior surfaces, and thereby proved the electrical nature of the phenomenon.

They found evidences of electrification at most tirnes, but especially when them were thunderclouds in the sky. Usually there was Little electrification at night, but it increased grcatly after sunrise and diminisbed after son&. Canton discovered tbat the air in a room could be electrified, as did Heccaria also. Canton showed that the air in a zoom acquired the same kind of electricity as a charged body in that room and that the divergence of two threads attached to the charged body gradually decreased as tbe air became electrified, even though the charge on the body was maintained hy an electrical machine.

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A History of Electricity and Magnetism by Herbert W. Meyer


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