File:D'Arsonval_ammeter_movement.jpg
From Wikipedia, the free encyclopedia
Size of this preview: 645 × 600 pixels. Other resolutions: 258 × 240 pixels | 516 × 480 pixels | 844 × 785 pixels.
Original file (844 × 785 pixels, file size: 75 KB, MIME type: image/jpeg)
This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
DescriptionD'Arsonval ammeter movement.jpg |
English: Drawing of D'Arsonval Galvanometer (ammeter) movement, of Weston type, from around 1900. This is the mechanism used in most moving-pointer (galvanometer) meters today. Only the pole pieces of the horseshoe-shaped magnet are shown, and part of the left-hand pole piece is broken out by the artist to show the coil. It consists of a light coil of wire with an attached pointer, suspended on jewel bearings between the poles of a magnet, with a spiral hairspring to return it to zero. When a current is passed through the coil, it creates a magnetic field that opposes the magnet's field, creating a torque that rotates the coil against the restoring force of the spring. The coil turns through an angle until the restoring force of the spring is equal to the force of the coil. Since the angle of deflection is proportional to the force, which is proportional to the current, the deflection is proportional to the current. The screwdriver slot at the top of the axis is for adjusting the meter to zero. Alterations: removed caption, and faint background discoloration. |
Date | |
Source | Downloaded from Flather, John J. (1900) Dynamometers and the Measurement of Power, 2nd Ed., John Wiley & Sons, New York, p.236, fig.81 on Google Books. The drawing is signed 'Bartlett & Co. N.Y.' |
Author | Bartlett & Co. N.Y. |
Permission (Reusing this file) |
Public domain - published in US before 1923 |
Licensing
Public domainPublic domainfalsefalse |
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
|
||
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
|
Items portrayed in this file
depicts
1900
image/jpeg
b660319f301588d9b90398f1c4a70ffd61e5f638
76,440 byte
785 pixel
844 pixel
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 20:16, 10 December 2007 | 844 × 785 (75 KB) | Chetvorno | {{Information |Description=Drawing of D'Arsonval ammeter movement. |Source=Downloaded from [http://books.google.com/books?id=lFcEAAAAMAAJ&pg=PA236 Flather, John J. (1900) ''Dynamometers and the Measurement of Power, 2nd Ed.'', John Wiley & Sons, New York |
File usage
The following pages on the English Wikipedia use this file (pages on other projects are not listed):
Global file usage
The following other wikis use this file:
- Usage on de.wikipedia.org
- Usage on et.wikipedia.org
- Usage on eu.wikipedia.org
- Usage on ja.wikipedia.org
- Usage on kk.wikipedia.org
- Usage on ru.wikipedia.org
- Usage on tr.wikipedia.org
Metadata
This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
If the file has been modified from its original state, some details may not fully reflect the modified file.
_error | 0 |
---|
Retrieved from "https://en.wikipedia.org/wiki/File:D%27Arsonval_ammeter_movement.jpg"