File:Sturgeon electromagnet.png

From testwiki
Jump to navigation Jump to search
    Original file (422 × 600 pixels, file size: 32 KB, MIME type: image/png)

    This file is from Wikimedia Commons and may be used by other projects. The description on its file description page there is shown below.

    Summary

    Description
    English: Drawing of the first electromagnet, invented in 1824 by British scientist William Sturgeon. This was his original drawing from his 1824 paper to the British Royal Society of Arts, Manufactures, and Commerce. It was made of 18 turns of bare copper wire (insulated wire had not been invented) on a U-shaped lacquered iron core about 1 ft (30 cm) long and 1/2 inch (13 mm) diameter. When the wires were connected to a single cell copper-zinc-acid battery, the electromagnet could support 9 pounds. The little cups contain mercury and were an early method of making an electrical contact between wires. The one on the left acts as a power switch. Alterations to image: converted from JPG to 32color PNG.
    (Detailed information is from Sylvanus P. Thompson (1891) Lectures on the Electromagnet, W.J. Johnson Co., New York, p.17-19)
    Date
    Source Downloaded August 9, 2008 from Joseph Henry's contributions to the Electromagnet, Smithsonian Institution Archives, neg. no. 46,761-D, where it is credited to Sturgeon, W. (1824) 'Improved Electro Magnetic Apparatus', Trans. Royal Society of Arts, Manufactures, and Commerce, Vol.43, Plate 3, fig.13.
    Author William Sturgeon
    Permission
    (Reusing this file)    		 Public domain - Author died 1850

    Licensing

    Public domain

    This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.

    You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
     Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Honduras has a general copyright term of 75 years, but it does implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information).
    This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

    Captions

    Add a one-line explanation of what this file represents

    Items portrayed in this file

    depicts

    File history

    Click on a date/time to view the file as it appeared at that time.

    Date/TimeThumbnailDimensionsUserComment
    current22:24, 9 August 2008Thumbnail for version as of 22:24, 9 August 2008422 × 600 (32 KB)wikimediacommons>Chetvorno{{Information |Description={{en|Drawing of first Wikipedia:electromagnet invented in 1824 by British scientist William Sturgeon. It was made of 18 turns of copper wire on an iron core. This is Sturgeon's original drawing from his paper to the Britis

    There are no pages that use this file.

    Retrieved from "https://en.wiki.beta.math.wmflabs.org/wiki/File:Sturgeon_electromagnet.png"