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

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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 center 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:
Public domain 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.

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Date/TimeDimensionsUserComment
current16:56, 14 August 2007908×1,366 (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)

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
Color 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