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Sault Ste. Marie Hydroelectric Complex
Society: ASCE Main Category: Civil Sub Category: Power Generation Era: 1900-1909 DateCreated: 1902 Salmon Run Way Sault Ste. Marie State: MI Zip: 49783 Country: USA Website: Creator: Modjeski, Ralph , Noble, Alfred

Located at the northern tip of Michigan where Lake Superior, Lake Michigan, and Lake Huron join together, the Sault Ste. Marie Hydroelectric Power Complex was built to harness the hydroelectric potential of the  20-foot falls at the headwaters of the St. Marys (sic) River, the sole outlet of Lake Superior. A century after its construction, the  plant remains the largest low-head hydroelectric facility in the United States. Today, the Sault Ste. Marie plant supplies electricity to area residents, especially those in the Upper Peninsula of Michigan.

Image Credit: Courtesy Flickr/Madison Berndt (CC BY 2.0) Image Caption: Sault Ste. Marie Hydroelectric Complex Era_date_from: 1902
Refrigeration Research Museum
Society: ASME Main Category: Mechanical Sub Category: Environmental Control Era: 1890-1899 DateCreated: 1890–1960 525 North 5th Street Brighton State: MI Zip: 48116 Country: USA Website:, Creator:

This collection includes many examples of advances in mechanical refrigeration for residential and commercial applications, dating from about 1890 to 1960. Such devices dramatically improved food storage safety and convenience and set high standards for mechanical reliability. The RRM collection contains products of such pioneers in the refrigeration industry as Frigidaire, Philco, Sunbeam, and Tecumseh. An archive is available to help researchers trace the history of the refrigeration industry.

Image Credit: Courtesy ASME Image Caption: Kelvinator refrigerator, 1948 Era_date_from: 1890–1960
Discovery of Organic Free Radicals by Moses Gomberg
Society: ACS Main Category: Chemical Sub Category: Frontiers of Knowledge Era: 1900-1909 DateCreated: 1900 University Of Michigan Ann Arbor State: MI Zip: Country: USA Website: Creator: Gomberg, Moses

In 1900, Moses Gomberg, Professor of Chemistry at the University of Michigan, confirmed the existence of a stable, trivalent organic free radical: triphenylmethyl. In so doing, he challenged the then prevailing belief that carbon could have only four chemical bonds. Gomberg’s discovery made a major contribution to theoretical organic chemistry and fostered a field of research that continues to grow and expand. Today, organic free radicals are widely used in plastics and rubber manufacture, as well as medicine, agriculture and biochemistry.

Image Credit: Public Domain (Copyright Exp.) Image Caption: Discovery of Organic Free Radicals by Moses Gomberg Era_date_from: 1900
Model T
Society: ASME Main Category: Mechanical, Road Sub Category: Road Transportation Era: 1900-1909 DateCreated: 1908-1927 The Henry Ford Museum
Dearborn State: MI Zip: Country: USA Website: Creator: Ford Motor Company, Wills, Childe

When Ford Motor Company introduced its new Model T on October 1, 1908, even an inveterate optimist like Henry Ford (1863-1947) could not predict the vast changes that his rather homely new vehicle would produce. What flowed from this series of bold innovations was more than an endless stream of Model Ts — it was the very foundation of the twentieth century itself. The assembly line became the century's characteristic production mode, eventually applied to everything from phonographs to hamburgers.

Image Credit: Courtesy Flickr/Don O'Brien (CC BY 2.0) Image Caption: Model T Era_date_from: 1908
Mackinac Bridge
Society: ASCE Main Category: Civil Sub Category: Bridges Era: 1950-1959 DateCreated: 1958 Mackinac Bridge St Ignace State: MI Zip: 49781 Country: USA Website: Creator: Steinman, David

The Mackinac (pronounced "Mack-in-awe") Bridge (1957) spans the Straits of Mackinac between Lake Michigan and Lake Huron, connecting the Lower and Upper peninsulas of Michigan.   Prior to the construction of the bridge, a fleet of nine ferries would carry as many as 9,000 vehicles per day, with traffic backups stretching as long as 16 miles.

Image Credit: Courtesy Flickr/Miss a Liss (CC BY-ND 2.0) Image Caption: Mackinac Bridge Era_date_from: 1958
Edison 'Jumbo' Engine-Driver Dynamo
Society: ASME Main Category: Electric, Mechanical Sub Category: Steam Era: 1880-1889 DateCreated: 1882 Henry Ford Museum Dearborn State: MI Zip: 48124 Country: USA Website: Creator: Edison, Thomas

This dynamo, connected directly to a high-speed steam engine, was one of six that produced direct current at Thomas A. Edison's electric power station at 257 Pearl Street in New York City. The Pearl Street Station was the prototype for central station power generation. Edison set out in 1878 to provide an electrical distribution system to bring lighting into the home: His first filament lamp lit on October 21, 1879. With the help of Frances Upton and C.L. Clarke, Edison built his engine-driven dynamo for the 1881 Paris Electrical Exposition.

Image Credit: Image Caption: Edison jumbo dynamo Era_date_from: 1882
Detroit-Windsor Tunnel
Society: ASCE Main Category: Civil Sub Category: Tunnels Era: 1930-1939 DateCreated: 1930 -Windsor Tunnel Detroit State: MI Zip: 48226 Country: USA Website: Creator: Value, Burnside, Thoresen, Søren Anton

The Detroit-Windsor Tunnel is a 5,160-foot structure that carries traffic under the Detroit River between Detroit, Michigan and Ontario, Canada. Privately financed, built, and owned, it was completed in 26 months, 10 months ahead of schedule. 

Image Credit: Courtesy Flickr/Brian Rawson-Ketchum (CC BY-SA 2.0) Image Caption: Detroit-Windsor Tunnel Era_date_from: 1930
Detroit Edison District Heating System
Society: ASME Main Category: Mechanical Sub Category: Environmental Control Era: 1900-1909 DateCreated: 1903 2000 Second Street Detroit State: MI Zip: 48226 Country: USA Website:, Creator: Holly, Birdsill

The concept of heating a number of buildings in the core area of a city from a single heating plant was introduced into the United States by Birdsill Holly at Lockport, New York, in 1877. The gain in thermal efficiency of a single large steam plant over a series of small isolated boilers led to widespread commercial installation of district heating. Organized by the Detroit Edison Company, the Central Heating Company began service here in 1903, supplying twelve customers with steam piped from the Edison Company's Willis Avenue Plant. Today's greatly enlarged system continues in operation.

Image Credit: Courtesy ASME Image Caption: Detroit Edison District Heating System Era_date_from: 1903
Society: ASME Main Category: Mechanical Sub Category: Manufacturing Era: 1920-1929 DateCreated: 1926 The Henry Ford Museum Dearborn State: MI Zip: 48124 Country: USA Website: Creator: Woods, William , Corning Glass Works
While Thomas Edison perfected the first practical and durable filament in 1879, it was not until much later that electricity left the laboratory to become the universal source of light. This required a tremendous number of glass envelopes for light bulbs. In the 1890s the top speed of the finest glass-blowing team produced two bulbs a minute.
Image Credit: Original Image: Courtesy Flickr/ellenm1 (CC BY 2.0) Image Caption: Corning Ribbon Machine Era_date_from: 1926
Society: ASME Main Category: Mechanical Sub Category: Pumping Era: 1890-1899 DateCreated: 1893 300 East Ludington Street Iron Mountain State: MI Zip: 49801 Country: USA Website: Creator: Edward P. Allis Company, Reynolds, Edwin
As one of the large strikes in the Lake Superior geological district, the Chapin Mine was located under a cedar swamp and unminable until it was drained by one of the largest pumping engines of the 1880s. Miners at the Chapin Mine, which began producing ore in 1880, soon tried to sink a deep shaft through 90 feet of quicksand, using enormous pumps driven by compressed air. The sand was frozen using two of the largest refrigeration compressors built, and a sectional cast-iron circular shell lined the D shaft. Mining continued for ten years using conventional pumps to dewater the lower levels.
Image Credit: Public Domain; Produced prior to 1/1/1923 Image Caption: Chapin Mine Pump Era_date_from: 1893
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