>The article is on the web at http://www.ncptt.nps.gov/notes/30/5_fs.stm>

It probably is there, but someone doesn't want me to read it!  Went to the
site, but for the life of me, couldn't see anything but a guy holding a
pendulum-like deviced against the wall of a brick tunnel.  Looks like what
little text did accompany the photo was hatched over or encrypted!?

Anyone else have any luck with it?

John Mascaro