Jim, If you have the magnetof a Lehman, it may be attracted to some magnetic material in the area, for example, steel reinforcing rods in a concrete floor. It doesn't take much iron nearby to cause a problem. Bob Barns JIM MARTIN wrote: > > Gentlemen, > > Well, things seem to be going along quite nicely, but I think I've hit a > roadblock. I can now setup the boom for a very repeatable 11sec period, > but I just can't seem to coax anymore out of it. I've tried tilting the > base with the front screw and bringing the rear boom pivot point closer to > the vertical plane of the wire pivot. Just doesn't seem to want to slow > down any more than about 11sec. > > I am using a 1/2" dia. threaded brass boom, with a sharpened point on the > pivot end. This point is pivoting in a VERY small dimple at the end of a > 3/8" bolt. I even tried applying a small amount of lube to the pointed > pivot, in an attempt to reduce any friction. > > Any suggestions? > > Jim Martin > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>