A worker inside Honeywell Corporation. Photograph by Olof Kallstrom for the Minnesota Geographic Society, 1978. Forms part of the Olof Kallstrom series of photographs from the Minnesota Historical Society’s City of Minneapolis documentary photography collection.

Native Americans mining pipestone at Pipestone Quarry, 1893. Pipestone has been mined by Dakota people in Minnesota for generations. Photographer: unknown.

Ojibwe wood mortar and pestle, a technology used to thresh wild rice.

Map of Canada, including parts of present-day Minnesota, created in Paris by the French cartographer Guillaume De Lisle in 1783. Mapping was a crucial technology for Europeans traveling across the North American continent looking to establish trade routes and relationships.

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

Chemistry laboratory at the University of Minnesota, 1907.

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

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