X-radiograph(s) of "Overmantle"

X-Radiograph Description: Negative, X-Radiograph X-Radiograph Settings: Left half: 21kv, 5 ma, 40 sec ; Right half: 20 to 30 kv, 5ma, 24 to 3 sec Burroughs Number: 3464 X-Radiograph(s) of: Artist: American School Title: Overmantle Date: 18th century Owner: Mrs. Kingsley Porter, Cambridge, MA