We were attending an event at the Heinz History Center and toured their current exhibit, which is about a steamboat that was found in a Kansas cornfield in 1988. The boat sank about 150 years ago and was originally manufactured in the Pittsburgh area. It was carrying cargo that the settlers in the western territories needed. Included in the items recovered from the ship were lightning rod insulators. They have two of them in the exhibit. There is a museum dedicated to the ship in Kansas City (http://1856.com). There were also a number of different bottles and many other interesting objects in the exhibit.