Hi, I have included a five page1938 article on how to construct your own seismograph from Modern Mechanix on my web page at: http://freeweb.pdq.net/fxc/ The web page SEISMOLOGY IN FRIENDSWOOD, TEXAS, USA, will take several minutes to download. I think many PSN members will be interested in the 1938 methods of constructing an amateur seismograph. How different it is today! Regards, Frank Cooper, Friendswood, Texas __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>