At 04:04 AM 1/15/01 , you wrote: >Hi > >I don't know what a mini-mini seismograph is but it cannot be >smaller than the Wood-Anderson torsional seismometer which has >a horizontal pendulum all of 6 millimetres long. The instrument >was sold in kit form by the Sprengnether Instrument Company of >St Louis. It was designed to record a trace on a drum wrapped >in photographic paper but one could substitute an electronic >optical transducer for the drum. See "The Amateur Scientist" >by CL Stong, Heinemann, 1962, page 229. This is the book >which started me off on seismography. If you cannot access >the book then I'll be happy to quote a few paragraphs for psn. > >Cheers all > >Danie Overbeek. THAT book started a lot of us on the path we are on now. Darrell __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>