There was an interesting article a year or two ago in Scientific American on the structural repairs to the Falling Water building.  As I recall, they had a few clever ways to measure the continuing movement of the cantilevered floors over significant periods of time.  You probably have copies of that article somewhere in your archive.
 
Aaron Goldblatt
-----Original Message-----
From: Museum discussion list [mailto:[log in to unmask]]On Behalf Of Susan Lerner
Sent: Monday, November 19, 2001 12:24 PM
To: [log in to unmask]
Subject:

Does anyone know if there are devises and or gauges that are able to monitor shifts or pre-existing cracks in building walls or foundations? 
Thanks,
Susan Lerner
Collections Manager
Frank Lloyd Wright Preservation Trust