File:Astatic Galvanometer brass and ivory.jpg
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Summary
[edit]DescriptionAstatic Galvanometer brass and ivory.jpg |
English: Closeup of an astatic galvanometer, showing the coils and the magnetic needle. the lower needle is inside the coils. An astatic galvanometer, invented by Leopoldo Nobili in 1825, is a historical instrument that measures electric current. It consists of two magnetized needles, suspended from their centers by a long thin fiber which can turn freely. One needle is inside a coil of wire. When electric current passes through the coil, its magnetic field causes the needle to turn from its equilibrium position perpendicular to the coil to be parallel to the coil's axis. The second needle (visible), located above the coil and magnetized in the opposite direction, serves to cancel out the effect of the Earth's magnetic field (that's what the "astatic" means), and also serve as a pointer to indicate tne magnitude of the current. |
Date | 20 December 2010 (original upload date) |
Source |
Own work Transferred from en.wikipedia |
Author | Williamgelbart at en.wikipedia |
Licensing
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
Original upload log
[edit]- 2010-12-20 02:00 Williamgelbart 709×831 (201682 bytes) Astatic galvanometer showing the coils and the magnetic needle. the lower needle is inside the coils.
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current | 20:29, 21 January 2011 | ![]() | 709 × 831 (197 KB) | MGA73bot2 (talk | contribs) | {{BotMoveToCommons|en.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} == {{int:filedesc}} == {{Information |description={{en|1=Astatic galvanometer showing the coils and the magnetic needle. the lower need |
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Metadata
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot A640 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/3.5 |
Date and time of data generation | 14:33, 19 December 2010 |
Lens focal length | 7.3 mm |
Width | 3,648 px |
Height | 2,736 px |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS5 Windows |
File change date and time | 17:28, 19 December 2010 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 14:33, 19 December 2010 |
Image compression mode | 5 |
APEX shutter speed | 5.90625 |
APEX aperture | 3.625 |
APEX exposure bias | 0 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Subject distance | 0.19 meters |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Focal plane X resolution | 12,710.801393728 |
Focal plane Y resolution | 12,725.581395349 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |