The Dome and Lightning Rod
Protecting the State House From Lighting
The lightning rod on the dome of the State House is the largest 'Franklin' lightning rod ever attached to a public or private building in Benjamin Franklin's lifetime. It was constructed in accord with Franklin's recommendations and has served the State House and the dome well for more than two centuries, with only one recorded instance of damage caused by lightning. The lightning rod is of wrought iron painted to protect it from corrosion. It is 28' tall and 2.5" square at its maximum thickness.