Thanks to Jim and Kevin, I now have a Lehman boom that is beginning to behave correctly. Thank you both for you help. In measuring the 'period' of the boom, is this the measurement of time it takes the boom to swing "out and back", when pushed, or the time it takes for the oscillations to die out completely? If I manually deflect the boom ~1" off of center, is the period the time it takes the boom to come back to center, or the time it takes the boom to move out to one side and then back past center to the other side? I know these are VERY elementary questions for this list, but hey, I've got to start somewhere, don't I ? My thanks in advance to anyone who wishes to help me out. Jim Martin New Haven, Indiana _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>