File:Clock Tower from Su Song's Book.JPG
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|DescriptionClock Tower from Su Song's Book.JPG||
Chinese mechanical and horological engineering from the Song Dynasty; this diagram provides an overall general view of the inner workings and armillary sphere of Su Song's clocktower built in Kaifeng. The drawn illustration comes from Su Song's book Xin Yi Xiang Fa Yao published in the year 1092. On the right is the upper reservoir tank with the 'constant-level tank' beneath it. In the centre foreground is the 'earth horizon' box in which the celestial globe was mounted. Below that are the time keeping shaft and wheels supported by a mortar-shaped end-bearing. Behind this is the main driving wheel with its spokes and scoops. Above that are the left and right upper locks with an upper balancing lever and upper link.
|Date||14 August 2007|
|Source||Page 451 of Joseph Needham's book Science and Civilization in China: Volume 4, Part 2, Mechanical Engineering.|
The official position taken by the Wikimedia Foundation is that "faithful reproductions of two-dimensional public domain works of art are public domain, and that claims to the contrary represent an assault on the very concept of a public domain". For details, see Commons:When to use the PD-Art tag.
|Exposure time||1/8 sec (0.125)|
|ISO speed rating||100|
|Date and time of data generation||11:36, 15 August 2007|
|Lens focal length||6.7 mm|
|File change date and time||11:36, 15 August 2007|
|Y and C positioning||Co-sited|
|Exposure Program||Normal program|
|Date and time of digitizing||11:36, 15 August 2007|
|Image compression mode||8|
|Maximum land aperture||3.625 APEX (f/3.51)|
|Flash||Flash fired, strobe return light detected, compulsory flash firing|
|Custom image processing||Normal process|
|Exposure mode||Auto exposure|
|White balance||Auto white balance|
|Scene capture type||Standard|
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