This is a functional glass seismograph for measuring earthquakes. It stands about 40" tall, and is about 48" wide installed. It measures vibrations along the x and y axes (side to side), as well as the z axis (up and down), on three helicorders. Ideally, it should be bolted into bedrock for accuracy...
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More contributors: Mark Frauenfelder (Editor-in-Chief, MAKE magazine), Kipp Bradford (Technical Consultant/Writer), Chris Connors (Education), Diana Eng (Guest Author), Peter Horvath (Intern), Brian Jepson (O'Reilly Media), Robert Bruce Thompson (Science Room)
Weekend Project: Making Char Cloth
Learn how to make a cheap and effective fire starter made from an old t-shirt. To download The Char Cloth video click here and subscribe in iTunes. See Char Cloth in action with the Fire Piston from William Gurstelle....
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