File:Reconstruction of obstacles and traps of the contravallation, Alesia (7700232060).jpg
![File:Reconstruction of obstacles and traps of the contravallation, Alesia (7700232060).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Reconstruction_of_obstacles_and_traps_of_the_contravallation%2C_Alesia_%287700232060%29.jpg/800px-Reconstruction_of_obstacles_and_traps_of_the_contravallation%2C_Alesia_%287700232060%29.jpg?20131213235954)
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Summary
[edit]DescriptionReconstruction of obstacles and traps of the contravallation, Alesia (7700232060).jpg |
In the plain, two trenches were the first obstacles positioned in front of the contravallation line. At the moment of the siege (late summer - early fall) the first and the widest was filled with water channeled from a stream, while the second was dry. The next obstacle was a 14 - 17 m wide glacis followed by two types of trap. First came the stimuli, metal goads embedded in short stakes planted in the ground and arranged in six rows in a staggered formation; A third, apparently dry, trench bordered the foot of the rampart. Contravallation: a fortification set up to protect a besieging force from attack by the defenders of the besieged place or by a relieving force from the outside |
Date | |
Source |
Reconstruction of obstacles and traps of the contravallation, Alesia
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Author | Carole Raddato from FRANKFURT, Germany |
Camera location | 47° 32′ 10.36″ N, 4° 29′ 37.5″ E ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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This image, originally posted to Flickr, was reviewed on 13 December 2013 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date. |
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current | 23:59, 13 December 2013 | ![]() | 4,288 × 3,216 (8.78 MB) | File Upload Bot (Magnus Manske) (talk | contribs) | Transferred from Flickr by User:Marcus Cyron |
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Metadata
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Image title | OLYMPUS DIGITAL CAMERA |
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Camera manufacturer | OLYMPUS IMAGING CORP. |
Camera model | SP800UZ |
Exposure time | 1/250 sec (0.004) |
F-number | f/5.7 |
ISO speed rating | 50 |
Date and time of data generation | 12:47, 2 August 2012 |
Lens focal length | 4.9 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Version 1.0 |
File change date and time | 12:47, 2 August 2012 |
Y and C positioning | Co-sited |
Exposure Program | Creative program (biased toward depth of field) |
Exif version | 2.21 |
Date and time of digitizing | 12:47, 2 August 2012 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 2.97 APEX (f/2.8) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 28 mm |
Scene capture type | Landscape |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |