LEHMAN Sketch of ‘Lehman’Seismograph   Lehman Pictures   Construction details including Kelly Knight’s article   Lehman Seismometer-PSN article   another Lehman design worth making   Chris Chapman’s Lehman

VERTICALS Vertical seismometer design   AS1 Seismometer   An Inexpensive Vertical Seismometer developed at Georgia Tech   Dewayne Hill’s homebrew vertical   The STM-8 Leaf Spring Seismometer   Bryant Labs Vertical based on ST-8 using force feeback - recommended ** Vertical Broadband Theory

SG Sensor Shackleford-Gundersen Seismometer   my SG Sensor version

General Bryant Labs...seismometer designs   “Spring Calculator”; a design tool for Vertical Seismometers by Bob McClure

Timing Recommended is the Garmin 18 GPS

DAMPING Seismometer Damping Ratio   Damping your Seismograph   Magnetic Damping method

Software & Hardware DATAQ Sales   DATAQ A-D Converter   AmaSeis software   Bob McClure’s seismometers & seismic programs Winquake       WinSDR

Digitisers A2D converter, ( analog to digital ) and seismic amplifiers manufactured and sold by Larry Cochrane, of Webtronics ( Redwood City, CA, USA.                http://www.seismicnet.com/#Equipment

• Seismometer Suspension Studies

A study on various pivot systems conducted by Charles R Patton; Chris Chapman & Brett Nordgren.

This study was undertaken to develop exact equations for some of the common systems allowing spreadsheet comparisons to provide insights into the pivot geometry and to explore some possible alternatives for future experimentation.