File:Ruhmkorff coil.png

Original file (1,280 × 560 pixels, file size: 287 KB, MIME type: image/png)

Captions

English

Add a one-line explanation of what this file represents

DescriptionRuhmkorff coil.png	English: Heinrich Daniel Ruhmkorff's induction coil. The mechanisms at the ends are interrupters, vibrating switches that interrupt the DC current flowing in the primary winding of the coil to create the flux changes necessary to induce high voltage in the secondary winding. This coil has two interrupters; the one at the right end is a common "hammer" interrupter with metal contacts. The one on the left is a type invented by Fizeau that uses a metal needle dipping into mercury, covered by a layer of alcohol to suppress the formation of sparks, resulting in higher voltages.
Date	1905
Source	Scanned from Bibliothek allgemeinen und praktischen Wissens für Militäranwärter Band III (Library of General and Practical Knowledge for Military Candidates, Volume III), 1905, Deutsches Verlaghaus Bong & Co, Berlin * Leipzig * Wien * Stuttgart
Author	Scan made by Kogo
Permission (Reusing this file)	Public Domain, because copyright expired

	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.

PDMCreative Commons Public Domain Mark 1.0falsefalse

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

	Date/Time	Thumbnail	Dimensions	User	Comment
current	20:02, 26 August 2005		1,280 × 560 (287 KB)	Kogo (talk \| contribs)

You cannot overwrite this file.

The following page uses this file:

The following other wikis use this file: