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Reverend John Harrison Macomber (standing at center) with Reverend James Franklin Chaffee, Chaucey and Harriet Hobart and Reverend John Hooper at Minnehaha Falls.

Reverend John Harrison Macomber (standing at center) with Reverend James Franklin Chaffee, Chauncey and Harriet Hobart and Reverend John Hooper at Minnehaha Falls

Rochester cyclone.

Rochester cyclone. Photo by Charles A. Tenney, August 21, 1883.

Rocks dropped from loaded barges, Duluth ship canal

Rocks dropped from loaded barges into the water, Duluth ship canal c.1900.

Roller coaster crew at Wonderland Park, Minneapolis; Robert Mauritz Swenson is second from left.

The roller coaster crew, c. 1906, with a view of the tracks.

Roller Coaster, Laughing Gallery and castle at Wildwood Park

Wildwood Amusement Park, c.1915.

Roller coaster, Wonderland Amusement Park, Minneapolis.

The Scenic Railway (a roller coaster) at Wonderland, from above, c. 1906.

Ronning Ensilage Harvester (front)

Ronning Ensilage Harvester (front) patented by Andrean and Adolph Ronning of Minneapolis in 1915. Manufactured by the American Harvester Company, also of Minneapolis.

Ronning Ensilage Harvester (side)

Ronning Ensilage Harvester (side) patented by Andrean and Adolph Ronning of Minneapolis in 1915. Manufactured by the American Harvester Company, also of Minneapolis.