Last Updated: 05/21/2012
SG Electronics Board
September 1975 Scientific American
article on how to build a Shackleford-Gundersen Seismometer.
made to the Redwood City Shackleford-Gundersen sensor.
(85k) contains all of the text and drawings above.
This is part of the online documentation I have for my
SG Electronics Board.
Photos of Steve Jones's S-G Sensor
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.
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.
(177k) contains all of the photos above.
A current schematic can be found
Larry Cochrane - www.seismicnet.com/contact.html