Hey Susan! Try contacting Woodlawn/Pope-Leighey. I know that they monitored their foundation shift for a few years before deciding to repour the slab. I believe they had a device for measuring the separation in the cracks as well. They have a new director but the assistant Gail Donahue was there at the time. If you don't already have the number it is (703)780-4000 ext 23. Sarah Andrews Woodrow Wilson House -----Original Message----- From: Susan Lerner [mailto:[log in to unmask]] 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 ========================================================= Important Subscriber Information: The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes). If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).