Ed, I have my SG sensor sitting on my concrete basement floor, and it is working ok. It has rather small leveling screws and I was having a problem with the thing getting out of level for no apparent reason, every day or so. I solved the problem by gluing a couple of aluminum plates to the concrete for the leveling screws to sit on. I'm guessing that adjusting the leveling screws was grinding the concrete surface and leaving a little dust under the screw that made the foundation a little "flakey". I suspect that unless your leveling screws are completely free of the carpet you're likely to have similar problems. Larry Conklin ----- Original Message ----- From: "Ed Ianni"
To: Sent: Saturday, December 30, 2000 10:27 AM Subject: Re: Lehman seismograph > Subject: Re: Lehman seismograph > > > > Hi PSN members. Thanks for welcoming me to the PSN network. I have > recently decided to build the Lehman seismograph.. I have completed the > Transducer part of my "Lehman" and I am about to build an amplifier (which I > dread[can they be purchased or "requisitioned" anywhere])?. I have a small > problem though and I hope that you may have some thoughts on it. The only> > feasable place for me to place the seismograph seems to be in my basement > > which has a thin carpet in it over a concrete floor. Do I need to cut the > > carpet away(the size of the Lehman base)? What do you think of the idea of > > using VERY LARGE and SHARP screws that would penetrate the carpet and they > > can also be used for Leveling? I have heard of some people using their > > seismographs on other than the ground floor (wouldn't the waves be > baffled/diminished)? > > Any thoughts would certainly be appreciated. Thank you very much, Ed. > > __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>