John Hopkinson

John Hopkinson (born July 27, 1849 in Manchester , † August 27, 1898 in Switzerland ) was a British physicist and electrical engineer.

Life

Hopkinson was the son of a mechanical engineer and studied at Owens College in Manchester and Trinity College in Cambridge, where he became a senior wrangler in the Tripos math exams in 1871. At the same time he earned a bachelor's degree from the University of London. He then worked first in his father's company and from 1872 as an electrical engineer in the lighthouse company Chance Brothers in Smethwick . In 1878 he moved to London as a consulting engineer, working particularly on the development of dynamos. From 1880 he was Professor of Electrical Engineering at King's College London and Director of the Siemens Laboratory in London.

The description of the magnetic resistance as the proportional ratio of the magnetic flow to the magnetic flux , the magnetic equivalent of the electrical Ohm's law , is called Hopkinson's law , but was first described in 1873 by Henry Augustus Rowland . Hopkinson held over 40 patents relating to electrical machines . Among other things, he received a patent on three-phase alternating current in 1882.

John Hopkinson died on August 27, 1898 in a mountain accident at Dent d'Hérens in Switzerland, along with one of his three sons and two of his three daughters. He was buried a few days later in Territet , and his wife stayed at the nearby Hôtel Byron .

He was a Fellow of the Royal Society (1877) and President of the Institution of Electrical Engineers (IEE) in 1890 and 1896.

literature

Kurt Jäger, Friedrich Heilbronner: Lexicon of electrical engineers . 2nd Edition. VDE publishing house, Berlin a. a. 2010, ISBN 978-3-8007-2903-6 .
Hopkinson, John . In: Encyclopædia Britannica . 11th edition. tape 13 : Harmony - Hurstmonceaux . London 1910, p. 686 (English, full text [ Wikisource ]).

Individual evidence

^ Henry A. Rowland: XIV. On magnetic permeability, and the maximum of magnetism of iron, steel, and nickel . In: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science . tape 46 , no. 304 , August 1, 1873, ISSN 1941-5982 , p. 140–159 , doi : 10.1080 / 14786447308640912 (doi.org/10.1080/14786447308640912 [accessed March 13, 2020]).

personal data
SURNAME	Hopkinson, John
BRIEF DESCRIPTION	British physicist and electrical engineer
DATE OF BIRTH	July 27, 1849
PLACE OF BIRTH	Manchester
DATE OF DEATH	August 27, 1898
Place of death	Switzerland

[1] Henry A. Rowland: XIV. On magnetic permeability, and the maximum of magnetism of iron, steel, and nickel . In: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science . tape 46 , no. 304 , August 1, 1873, ISSN 1941-5982 , p. 140–159 , doi : 10.1080 / 14786447308640912 (doi.org/10.1080/14786447308640912 [accessed March 13, 2020]).