Lower section of the electric light mast at Bridge Square, Minneapolis, ca. 1883. The first centralized hydroelectric power in the United States turned on in downtown Minneapolis on September 5, 1882.
Hot pond and log storage for the new mill of the Northern Lumber Company (Cloquet Lumber Company), 1930. Heated mill ponds, or “hot ponds,” were developed to warm logs so they could be cut even in the winter. Photograph by Buckbee-Mears Company.
Surgical clamp designed by Owen Wangensteen, chief of surgery at the University of Minnesota and used by Dr. Palmer Peterson in his Minneapolis medical practice from 1952 until 1998.