This site has information on seismometers, seismographs, and seismoscopes (the first of which, it says, "was invented by the Chinese philosopher Chang Heng in A.D. 132").
It claims that "It is relatively easy to acquire the necessary materials and build your own seismometer," and provides relevant links.
Since I know people who like to build their own scientific equipment, such as telescopes (including trying to grind their own lenses), I thought I'd throw this out there.
Have fun, guys. And let me know how it works out.
The Black Fawn by Jim Kjelgaard
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Jim Kjelgaard was a prolific author of over forty novels for children and
young adults, mostly animal stories. His most famous and best-selling book
was Bi...
16 hours ago
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