Earlier this week, Steinway & Sons company forwarded to me some interesting 
information about the history of frequency standards for tuning pianos.  It 
might be of interest to ARSClisters.  It's uploaded to share here:  

https://www.box.com/s/8b2f850ad816d6eb0cd6


Jerry Fabris, Museum Curator
Thomas Edison National Historical Park
National Park Service
United States Department of the Interior
211 Main Street
West Orange, New Jersey 07052
tel:  (973) 736-0550, ext. 48
fax: (973) 243-7172