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The history of early seismometers

Link to live Seismic Drum at Geonet's Mangatainoka River station in New Zealand

The Lehman amateur seismograph, from Scientific American - not designed for calibrated measurement.

Sean Morrisey's professional design of an amateur teleseismograph Also see Keith Payea's version Both accessed 2010-9-29 Morrissey was a professional seismographic instrument engineer.  This superior design uses a zero-length spring to achieve a 60 second period, active feedback and a uniquely convenient variable reluctance differential transducer, with parts scavenged from a hardware store.  The frequency transform is carefully designed, unlike most amateur instruments.  Morrisey is deceased, but the site remains up as a public service.

USGS evaluation of Streckheisen STS-2 Seismometer models - Streckheisen is a common make of research seismometers

Pacific Northwest Seismograph Network-PNSN is a seimograph network in the northwest USA

SeisMac  is a free tool for recent Macintosh laptop computers that implements a real-time three-axis seismograph.

The Incorporated Research Institutions for Seismology (IRIS) is a principal U.S. seismological instrumentation and data facility, principally supported by the National Science Foundation and the U.S. Department of Energy.

The Development Of Very-Broad-Band Seismography: Quanterra And The Iris Collaboration discusses the history of development of the primary technology in global earthquake research.

Video of seismograph atHawaiian Volcano Observatory - on Flickr - retrieved on 2009-06-15.