Image:Clock Tower from Su Song's Book.JPG

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Image:Clock Tower from Su Song's Book.JPG

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Full resolution‎ (908 × 1,366 pixels, file size: 722 KB, MIME type: image/jpeg)

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Description	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.
Source	Page 451 of Joseph Needham's book Science and Civilization in China: Volume 4, Part 2, Mechanical Engineering.
Date	August 14, 2007
Author	PericlesofAthens
Permission ( Reusing this image)	see below

This is a faithful photographic reproduction of an original two-dimensional work of art. The original image comprising the work of art itself is in the public domain for the following reason:

This image (or other media file) is in the public domain because its copyright has expired.

This applies to the United States, Canada, the European Union and those countries with a copyright term of life of the author plus 70 years.

Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Côte d'Ivoire has a general copyright term of 99 years and Honduras has 75 years, but they do implement that rule of the shorter term.

Under United States copyright law, originality of expression is necessary for copyright protection, and a mere photograph of an out-of-copyright work may not be protected under U.S.copyright law. This photograph was taken in the U.S. or in another country where a similar rule applies (for a list of allowable countries, see Commons:When to use the PD-Art tag#Country-specific rules).
This photographic reproduction is therefore also in the public domain.

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	Date/Time	Dimensions	User	Comment
current	16:56, 14 August 2007	908×1,366 (722 KB)	PericlesofAthens	({{Information \|Description=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 come)

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Metadata

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Camera manufacturer	SONY
Camera model	DSC-T1
Exposure time	1/8 sec (0.125)
F-number	f/3.5
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	2
Exposure Program	Normal program
ISO speed rating	100
Exif version	2.2
Date and time of digitizing	11:36, 15 August 2007
Image compression mode	8
Exposure bias	0
Maximum land aperture	3.625
Metering mode	Pattern
Light source	Unknown
Flash	15
Colour space	sRGB
Custom image processing	Normal process
Exposure mode	Auto exposure
White balance	Auto white balance
Scene capture type	Standard
Contrast	Normal
Saturation	Normal
Sharpness	Normal

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