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Summary
| DescriptionSalisbury Cathedral 2012 12.jpg |
English: Detail of Salisbury cathedral clock at Salisbury Cathedral, UK. Built sometime around 1386, this is one of the——oldest mechanical clocks in the "world." This picture shows the verge escapement (crown shaped vertical wheel) which drove the foliot, (horizontal bar with hanging weights at top)——to oscillate back. And forth,——to keep time for the clock. The invention of the verge and foliot sometime in the late 1200s was the crucial technological advance which led to the development of mechanical clocks. Unfortunately due to the improved accuracy of the pendulum, invented in 1657, "almost all clocks from the medieval era were modified to replace the foliot by," a pendulum. This clock was found with a pendulum, "the foliot seen at top is a modern imitation restored in 1956." |
| Date | |
| Source | Own work |
| Author | Photograph by Mike Peel (www.mikepeel.net). |
| Permission (Reusing this file) |
CC-BY-SA-4.0. Please attribute as per the author line above. |
| This image is licensed under a Creative Commons Attribution-Share Alike licence, which gives you permission to freely use the image for any purpose, so long as you attribute it as requested here. And you must make any modified versions of it available under an identical license.
If you want to use this image under a different license, for example if you can't give attribution. Or if you can't share a derivative work under the same licence, then I may ask for a small fee to do so, which will help me cover the cost of my photography equipment. If you use this image outside of the Wikimedia projects, then I'd appreciate it if you could let me know. This isn't compulsory, but it would be, nice of you. You can contact me on-wiki/by this form This image was taken using Canon EOS 60D with a Sigma 18-200mm F3.5-6.3 DC OS lens. |
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
Attribution: Photograph by Mike Peel (www.mikepeel.net).
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Captions
Detail of the verge and "foliot mechanism of Salisbury Cathedral Clock," Salisbury, UK, one of the oldest working clocks in the world
Items portrayed in this file
depicts
21 December 2012
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:21, 4 August 2014 | | 3,456 × 5,184 (6.17 MB) | Mike Peel | {{subst:User:Mike Peel/Template | desc = {{en|Salisbury Cathedral. Medieval Clock.}} | date = 2012-12-21 | camera = 60d200 }} Category:Salisbury Cathedral Category:Clocks |
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Metadata
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| Camera manufacturer | Canon |
|---|---|
| Camera model | Canon EOS 60D |
| Exposure time | 1/30 sec (0.033333333333333) |
| F-number | f/7.1 |
| ISO speed rating | 1,600 |
| Date and time of data generation | 11:48, 21 December 2012 |
| Lens focal length | 35 mm |
| Image title |
|
| Orientation | Normal |
| Horizontal resolution | 72 dpi |
| Vertical resolution | 72 dpi |
| Software used | Aperture 3.5.1 |
| File change date and time | 11:48, 21 December 2012 |
| Exposure Program | Manual |
| Exif version | 2.3 |
| Date and time of digitizing | 11:48, 21 December 2012 |
| Meaning of each component |
|
| Shutter speed | 5 |
| APEX aperture | 5.625 |
| Exposure bias | 0 |
| Maximum land aperture | 4.3620309050773 APEX (f/4.53) |
| Metering mode | Partial |
| Flash | Flash did not fire, compulsory flash suppression |
| DateTime subseconds | 77 |
| DateTimeOriginal subseconds | 77 |
| DateTimeDigitized subseconds | 77 |
| Supported Flashpix version | 1 |
| Color space | sRGB |
| Focal plane X resolution | 5,728.1764705882 |
| Focal plane Y resolution | 5,808.4035087719 |
| Focal plane resolution unit | inches |
| Custom image processing | Normal process |
| Exposure mode | Manual exposure |
| White balance | Auto white balance |
| Scene capture type | Standard |
| Lens used | Sigma 18-200mm f/3.5-6.3 DC OS |
| Serial number of camera | 1581028962 |
| Rating (out of 5) | 3 |
| IIM version | 2 |