![File:Tangent galvanometer Philip-Harris top1.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/4/40/Tangent_galvanometer_Philip-Harris_top1.jpg/600px-Tangent_galvanometer_Philip-Harris_top1.jpg)
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Summary
DescriptionTangent galvanometer Philip-Harris top1.jpg |
English: en:Tangent galvanometer made by en:Philip Harris Ltd., Birmingham, England, ca. 1950. From the Sammlung historischer Messtechnik (Collection of historical measurement apparatus), A. Kusdas. In the middle of the galvanometer is a compass that is aligned to be horizontal using the brass leveling screws. The black ring has a diameter of 17 cm; it houses a circular coil of wire. In use, the galvanometer is rotated on a table so that this ring is parallel to the direction of the earth's local magnetic field, and the compass needle will be parallel to the ring. As can be seen, the apparatus was not aligned when the photograph was taken. When a source of electrical current is hooked up to the coil, the resulting magnetic field causes the compass needle to rotate away from its initial alignment parallel to the coil. The angle of rotation is used to calculate the current through the coil. |
Date | |
Source | http://www.historische-messgeraete.de/images/gb_philip-harris_tangent-galvanometer1_top1.jpg |
Author | Alexander Kusdas |
Permission (Reusing this file) |
Lizenzbestimmungen (in German). Sammlung historischer Messtechnik. Retrieved on 2012-12-20. Licensing for re-use of text and photographs from the website http://www.historische-messgeraete.de is offered under the German version of the CC-BY-SA 3.0. |
Other versions | There are links to about a dozen photographs of the same apparatus from different perspectives at Tangential-Galvanometer, Philip Harris, ca. 1950 (in German). Sammlung historischer Messtechnik. Retrieved on 2012-12-20. |
Licensing
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Annotations InfoField | This image is annotated: View the annotations at Commons |
leveling screw. In use, the galvanometer is leveled.
circular wire coil. The electrical connections to this coil are made at the bottom of the galvanometer; the connectors are hidden by the compass.
compass
indicator needle. When there is no electrical current flowing through the coil, the needle is perpendicular to the earth's magnetic field. The needle is then deflected by the magnetic field created by an electrical current.
leg of the tripod that supports the galvanometer
magnetic needle. When there is no electrical current through the galvanometer coil, this needle is parallel to the earth's local magnetic field.
mirror. Used to reduce parallax errors in reading the angular position of the indicator needle.
scale. Marked in degrees; used with the indicator needle.
Captions
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depicts
4 February 2012
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 05:07, 20 December 2012 | ![]() | 1,024 × 1,024 (105 KB) | Easchiff | User created page with UploadWizard |
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Camera manufacturer | NIKON CORPORATION |
---|---|
Camera model | NIKON D300S |
Author | KUSDAS ALEXANDER |
Copyright holder | KUSDAS ALEXANDER |
Exposure time | 1/1 sec (1) |
F-number | f/22 |
ISO speed rating | 200 |
Date and time of data generation | 14:47, 4 February 2012 |
Lens focal length | 35 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Capture NX 2.2.8 W |
File change date and time | 23:11, 4 February 2012 |
Y and C positioning | Centered |
Pair of black and white reference values |
|
Exposure Program | Manual |
Exif version | 2.3 |
Date and time of digitizing | 14:47, 4 February 2012 |
Meaning of each component |
|
Exposure bias | 0 |
Maximum land aperture | 1.6 APEX (f/1.74) |
Metering mode | Spot |
Light source | Unknown |
Flash | Flash did not fire |
DateTime subseconds | 82 |
DateTimeOriginal subseconds | 82 |
DateTimeDigitized subseconds | 82 |
Supported Flashpix version | 1 |
Color space | Uncalibrated |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 52 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
GPS tag version | 0.0.2.2 |