File:Pièce de catapulte romaine, Musée gallo-romain de Fourvière.jpg
Original file (2,448 × 3,264 pixels, file size: 1.47 MB, MIME type: image/jpeg)
Captions
Summary
[edit]DescriptionPièce de catapulte romaine, Musée gallo-romain de Fourvière.jpg |
Français : Cadre de fer et manchons appartenant au mécanisme d'une catapulte romaine, conservés au Musée gallo-romain de Fourvière, à Lyon, en France.
Ces pièces ont été découvertes au XIXe siècle sur la colline de Fourvière, dans le cinquième arrondissement de Lyon, dans la propriété de l'Antiquaille, mais elles n'ont été identifiées que récemment. Ces pièces appartenaient au mécanisme de détente d'une catapulte romaine. Ce type d'enfin était formé d'un arc placé à l'horizontal et dont la détente était rendue plus puissante par des mécanismes en fer. Chacun des deux bras de l'arc était passé dans un cadre de fer autour duquel s'enroulaient des fibres dont la torsion augmentait la puissance du tir. Les deux manchons métalliques circulaires retrouvés, munis chacun d'une clavette soudée, se plaçaient à chaque extrémité du cadre. Une catapulte de ce modèle pouvait tirer des flèches jusqu'à 500 mètres. Dessin de reconstitution de la catapulte : D. Baatz. Dessins de reconstitutions de machines proches de celle de Lyon : d'après D.B. Campbell, dessins B. Delf. |
Date | |
Source | Own work |
Author | Eunostos |
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File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:54, 30 May 2016 | 2,448 × 3,264 (1.47 MB) | Eunostos (talk | contribs) | User created page with UploadWizard |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Exposure time | 1/30 sec (0.033333333333333) |
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F-number | f/3.4 |
Date and time of data generation | 13:27, 28 May 2016 |
Lens focal length | 4.3 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Windows Photo Editor 6.3.9600.17418 |
File change date and time | 23:34, 29 May 2016 |
Y and C positioning | Co-sited |
Date and time of digitizing | 13:27, 28 May 2016 |
Meaning of each component |
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Image compression mode | 2 |
APEX shutter speed | 5 |
APEX aperture | 3.53 |
APEX brightness | 0.75 |
APEX exposure bias | 0 |
Maximum land aperture | 3.53 APEX (f/3.4) |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 5,307 |
Focal plane Y resolution | 5,307 |
Focal plane resolution unit | 3 |
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 | Auto exposure |
Scene capture type | Standard |
Subject distance range | Unknown |