In the 1850s, the Lexington and Danville Railroad began building a suspension bridge over the Kentucky River. The bridge was designed by John A Roebling. Due to unforeseen increases in train loads, the Roebling bridge was never completed. The High Bridge would then be built 20 years later on the existing foundations.
USA
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Image Credit:
Public Domain (Author's Choice)
Image Caption:
High Bridge
Era_date_from:
1877
1985
This machine is an unusual triple-expansion, three-crank rocker engine, which in its day was a high-capacity unit providing outstanding performance for the Boston Water Works Corporation. Designed by Erasmus Darwin Leavitt, Jr. (1836-1916), Engine No. 3 was installed in 1894 to a high-service pumping facility on the south side of the Chestnut Hill Reservoir in Brighton.
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Image Credit:
Public Domain (National Park Service)
Image Caption:
Leavitt-Riedler Pumping Engine
Era_date_from:
1894
1973
Some of the station's notable achievements:
The first method for detecting radioactive particles in water supplies
A successful system of slow-sand filter beds for drinking water
The landmark demonstration that microorganisms carried within filter media could degrade sewage
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Image Credit:
Public Domain (Author's Choice)
Image Caption:
Lawrence Experiment Station
Era_date_from:
1886
1975
As ideas developed, they abandoned infrared radiation to instead concentrate upon visible light. The concept originally was called an "optical maser". In 1958, Bell Labs filed a patent application for their proposed optical maser; and Schawlow and Townes submitted a manuscript of their theoretical calculations to the Physical Review, published that year in Volume 112, Issue No. 6.
Simultaneously, at Columbia University, graduate student Gordon Gould was working on a doctoral thesis about the energy levels of excited thallium.
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Image Credit:
Courtesy of the US Air Force
Image Caption:
A scientist tests a laser at the U.S. Air Force Research Laboratory.
Era_date_from:
1957
The La Esperanza sugar mill steam engine is one of the few remaining American links to the pioneer beam engines of the English inventors Thomas Newcomen (1712) and James Watt (1769). The engine was built in 1861 in Cold Spring, New York, by the West Point Foundry. The general arrangement and details, including the Gothic embellishment, are typical of machinery of the period. The straight-line motion of the piston rod is accommodated to the arc of the moving beam end by a parallel motion. Watt regarded this ingenious linkage as the invention of which he was most proud.
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Image Credit:
Public Domain (National Park Service)
Image Caption:
Hacienda La Esperanza Sugar Mill Steam Engine
Era_date_from:
1861
1979
This is one of the earliest US foundry-machine shops remaining in operation and one of the few water powered. It was founded by Samuel N. Knight (1838-1913) to manufacture machinery for the gold mines of the Mother Lode region. Knight was one of several inventors experimenting with impulse turbines to exploit the area's abundant high-head water power for driving hoists, ore stamps, and other mining machinery.
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Image Credit:
Courtesy Wikipedia/Bobak Ha'Eri (CC BY 3.0)
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Knight Foundry and Machine Shop
Era_date_from:
1873
1995
The workforce consisted of less than 100 men, yet they finished construction in just 94 days. Such speed was possible due to the elimination of scaffolding. Instead, iron rods were used to support construction of the trusses between the towers, and workers moved back and forth across the rods. A dangerous venture, yet no workers were seriously injured.
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Image Credit:
Courtesy Flickr/Peter Pawlowski (CC BY 2.0)
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Kinzua Railway Viaduct
Era_date_from:
1882
1982
When Governor James Grant arrived in the newly acquired British colony of East Florida in 1764, he found it devoid of settlers. To increase both the population and commerce with the 13 colonies to the north, he commanded that a road be built from his provincial capital of St. Augustine to Ft. Barrington, Georgia.
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Section of a map showing King's Road in the Territory of Florida, by the United States Army Corps of Engineers, published in 1839.
Era_date_from:
1775
1976
The Charles River Basin was one of the pioneering environmental engineering projects in America. The project transformed 675 acres of unhealthy and unsightly salt marshes and tidal flats were into an environmental centerpiece for the Boston area by 1910. This was one of the first public projects to radically improve the environment and has served as a model for similar projects around the nation.
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Image Credit:
Courtesy Wikipedia/Daderot (CC BY-SA 3.0)
Image Caption:
Charles River Basin Project
Era_date_from:
1910
1981
A 214-foot single-span covered wooden bridge, built above the cribs of stone in the AuSable River that served to break log jams and ice floes, collapsed during the winter of 1875 under the weight of a three-foot snowfall and high winds. The "Upper Bridge" (pictured) was built in its place.
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Image Credit:
Public Domain (Released by Creator)
Image Caption:
The Keeseville Suspension Bridge built 1888, Keeseville, one of the three "Bridges of Keeseville" that span the AuSable River
Era_date_from:
1878
1987
