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

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.
Date 14 August 2007
Source Page 451 of Joseph Needham's book Science and Civilization in China: Volume 4, Part 2, Mechanical Engineering.
Author PericlesofAthens
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Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.
Camera manufacturer SONY
Camera model DSC-T1
Exposure time 1/8 sec (0.125)
F-number f/3.5
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
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 APEX (f/3.51)
Metering mode Pattern
Light source Unknown
Flash Flash fired, strobe return light detected, compulsory flash firing
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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