Shackleford-Gundersen Seismometer

Last Updated: 04/01/2001

SG Electronics Board

September 1975 Scientific American article on how to build a Shackleford-Gundersen Seismometer.
Changes made to the Redwood City Shackleford-Gundersen sensor.
SGSENSOR.ZIP (85k) contains all of the text and drawings above.
Construction Notes. This is part of the online documentation I have for my SG Electronics Board.

Photos and Schematic of the Redwood City SG Seismometer

Sensor in operation showing the box that covers the sensor.
Inside the box showing the foam rubber used to stop air currents.
Overall view of the sensor with the box removed.
Top of the sensor showing the hindge used to hold the pedulum and power the transmitter.
Midway down the pedulum showing a screw used for counter weight and the magnet in the damping coil.
Bottom of the pendulum showing the two receiving plates, the transmitter on the pedulum. Another view.
SGPHOTOS.ZIP (177k) contains all of the photos above.
A current schematic can be found here.

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