Lighting tower at Bridge Square, Minneapolis

Lighting tower at Bridge Square, Minneapolis

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.

Students in biology laboratory

Students in biology laboratory

Students in a biology laboratory at the University of Minnesota, ca. 1902.

Chemistry laboratory at the University of Minnesota

Chemistry laboratory at the University of Minnesota

Chemistry laboratory at the University of Minnesota, 1907.

Iron ore shaft, Eveleth

Iron ore shaft, Eveleth

An iron ore shaft in Eveleth. Photograph by William F. Roleff, 1915.

Cloquet Lumber Hot Pond

Cloquet Lumber Hot Pond

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.

Students in science class

Students in science class

Students use a microscope in a science class at Unity Church, St. Paul, 1930.

Researchers at the University of Minnesota

Researchers at the University of Minnesota

Researchers at the University of Minnesota working on a project affiliated with the Works Progress Administration (WPA), ca. 1940.

Chromotherm advertisement

Chromotherm advertisement

Stand-up sign advertising the Honeywell Chromotherm, ca. 1930s‒1945. Used at Donaldson’s department stores.

Science lab at Villa Maria Academy, Frontenac (Goodhue County)

Science lab at Villa Maria Academy, Frontenac (Goodhue County)

Students in a science class at Villa Maria Academy in Frontenac (Goodhue County), between 1943 and 1944.

Surgical clamp designed by Owen Wangensteen

Surgical clamp designed by Owen Wangensteen

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.

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