This picture was taken at a genealogy conference in Oshawa, Ontario, a few years ago. I could not resist taking a picture as it had a math reference besides being an unusual tombstone (college campuses typically don't have tombstones near their buildings, but I imagine there are exceptions).
Napier's Bones are one of those tools used in the past that are no longer used today, often like some of the items one finds in an old estate inventory.
