The Lahrs wrote: > Hi Cap, > > I put the McWilliams Magnetometer article on this web page: > http://lahr.org/john-jan/earth_science/magnetometer/ > Let me know if you seen any problems with it. Which issue of the > Solar Bulletin was it in? > > Cheers, > John > > At 11:02 AM 7/11/00 , you wrote: > >Hi John, > > I checked your excellent web site to see if I could refer someone to it > >who is interested in building a McWilliams Magnetometer. As it is now I have > >to send them photocopies of Jim Mandaville's article in the Solar Bulletin by > >snail mail. Besides his magnetometer Jim also has a "whistler Receiver" that > >is simple to build and would be very suitable to build as a science fair > >project. Whistlers are a natural phenomenon that originate in the > >magnetosphere where the magnetic storms occur so both can be projects to > >learn about the geophysics of the Earth's magnetosphere. We are approaching > >solar maximum when whistlers and magnetic storms are both plentiful. Are you > >interested in whistlers and would you like to add the whistler receiver to > >your science projects? > >Best regards, > >Cap > Hi all, I note that the Forcefield/Wondermagnet web site has a relatively big (6" length, 1" width by 1/2" thick) ceramic (ferrite) magnet for sale for U.S. $5.50 each. 800 gauss. The flat surface maybe easier to work with than a round rod. Whether or not they are adequate for this application I don't know. I'd question whether a series of neodymium magnets could be better or worse than a item like this in comparison trials. One might even add on a neo or two on the ends of this, and see if it helps the sensitivity aspect? See: http://www.wondermagnet.com/dev/magnet26.html Meredtih Lamb __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>