Chinese Inventions : The Seimograph
Why they invented the seimograph
China had always had been plagued and the government wanted to know where the earthquake would effect them. Then, in the second century a great scientist, and a mathematician, and an inventor invented the seimograph. His invention was noted in the court records of the Han Dynasty. The modern seismograph was invented in 1848.
Different types of seimographes
The modern seismograph: http://en.wikipedia.org/wiki/Seismometer
The gray background seismograph: http://www.clcillinois.edu/programs/esc/index.asp?seismic
The video: http://www.youtube.com/watch?v=T9qhq7MALVU