Salisbury_Cathedral_2012_12.jpg
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Summary
| Description |
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 or by this form This image was taken using a 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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