Designed and constructed in the early 1940s, this laboratory has an unequalled capacity to simulate a wide range of climatic conditions from arctic cold to jungle moisture. Data from tests of some three hundred different aircraft and over two thousand items of equipment has provided information vital to the performance, safety, and reliability of aircraft operating in extremes of weather.
USA
YearAdded:
Image Credit:
Public Domain (United States Air Force)
Image Caption:
McKinley Climatic Laboratory
Era_date_from:
1944
1987
When the Adams Plant went into operation on August 26, 1895, it represented a key victory for alternating-current systems over direct-current. The clear advantage of high voltage AC for long distance power transmission and the unprecedented size of the plant (it reached its full capacity of ten 5,000-HP generators in May 1900) influenced the future of the electrical industry worldwide.
In August 1895 the Adams No. 1 generating station of the Niagara Falls Power Company first supplied electric power to local industries in Niagara Falls, New York.
YearAdded:
Image Credit:
Courtesy Wikipedia/Lvklock (CC BY-SA 3.0)
Image Caption:
Adams Hydroelectric Generating Plant
Era_date_from:
1895
1990
The Rogue River Bridge was the most advanced concrete bridge in America when it was built. Distinguished bridge engineer Conde McCullough employed the techniques of Frenchman Eugene Freyssinet to create thin, graceful concrete arches for this seven-span structure.
Pre-compression of the concrete arch was achieved and, as a result of its success, pre-stressing became one of the hallmarks of American bridge building techniques.
YearAdded:
Image Credit:
Courtesy Flickr/Bruce Fingerhood (CC BY 2.0)
Image Caption:
Rogue River Bridge
Era_date_from:
1931
1982
The granite milestones marking the Mason-Dixon Line bear crests from the two parties involved in the land-grant dispute, the families of William Penn and Charles Calvert (also known as Lord Baltimore).
YearAdded:
Image Credit:
Original Image: Flickr/Padraic (CC BY-SA 2.0)
Image Caption:
Mason-Dixon Line
Era_date_from:
1767
1977
Designed by Claude A. P. Turner, a pioneer of reinforced concrete construction, the Marshall Building was constructed originally in 1906 as a five-story building. In 1911 the sixth floor of the building was added as per Turner's original design. This building is the oldest extant example of Turner's "mushroom" flat-slab system which transformed the design and construction of reinforced-concrete floors worldwide.
YearAdded:
Image Credit:
Courtesy ASCE
Image Caption:
Marshall Building
Era_date_from:
1906
2002
When opened in 1909, the 1,470 foot long main span of the Manhattan Bridge was the third longest suspension bridge span in the world, after the nearby Brooklyn and Williamsburg Bridges. The Manhattan Bridge has two 725 foot long suspended side spans for an overall length of 2,920 feet. The bridge deck is supported by 4 main cables of 20.75 inch diameter, each composed of more than 35,000 individual wires. The bridge deck is stiffened by four parallel trusses of 24 foot depth, hinged at the towers.
YearAdded:
Image Credit:
Courtesy Flickr/Dave Herholz (CC BY-SA 2.0)
Image Caption:
Manhattan Bridge
Era_date_from:
1909
2009
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.
YearAdded:
Image Credit:
Courtesy Flickr/Miss a Liss (CC BY-ND 2.0)
Image Caption:
Mackinac Bridge
Era_date_from:
1958
2009
The Belle of Louisville, built in 1914, is the oldest operating “western rivers” steamboat. It has the shallow-draft flat-bottom hull braced by hog-chain trusses, multiple fire-tube boilers, paddlewheel propulsion, and superstructure configuration that were characteristic of hundreds of steamboats that plied America’s rivers during the 19th and 20th centuries
YearAdded:
Image Credit:
Courtesy Flickr/Bailey Visual Life (CC BY 2.0)
Image Caption:
Belle of Louisville, still in operation
Era_date_from:
1914
2010
At the mountain where the Civil War's Battle Above the Clouds was waged, tourist business has thrived from the building of its first toll road (Whiteside Pike) in 1857 to present day.
YearAdded:
Image Credit:
Courtesy Flickr/Duane Tate (CC BY 2.0)
Image Caption:
Lookout Mountain Incline Railway
Era_date_from:
1895
1991
This steam crawler-tractor emancipated horses from the killing work of hauling trains of sleds over iced roads in the winter woods of the United States and Canada.
Designed, patented (1901), and built by Alvin C. Lombard (1856-1937) of Waterville, Maine, eighty-three "Lombards" were the first practical examples of the often-tried lag or crawler tread that would become the mark of the internal combustion engine-driven agricultural and construction equipment and military tank in current use.
YearAdded:
Image Credit:
Courtesy Flickr/cliff1066,
Image Caption:
Lombard Steam Log Hauler
Era_date_from:
1910
1982
