Greetings, Our institution cares for a large collection of 19th century Haida and Tlingit totem poles. I am looking for a source or ideas for fabricating a crack monitoring device. I recall seeing a commercially available crack monitor 4-5 years ago, but can not remember who manufactured it. Thanks for your help! Chris Hanson Sr. Curator of Collections Ketchikan Museums ========================================================= 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).