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Pit Silo
Society: ASABEMain Category: Agricultural & BiologicalSub Category: StorageEra: 1870-1879DateCreated: 1876Oakland ManorColumbiaState: MDZip: 21044Country: USAWebsite: https://www.asabe.org/awards-landmarks/asabe-historic-landmarks/pit-silo-6.aspxCreator: Morris, Francis

Designated a Historic Landmark of Agricultural Engineering at Oakland Manor In 1876 Francis Morris Built Brick Silos in His Barn and Introduced the Practice of Making Corn Silage in the United States. His Further Experiments Developed the Use of Earthen Trenches and Thereby Significantly Contributed to the Development of American Agriculture Dedicated by Amercan Society of Agricultural Engineers 1976

YearAdded:
1976
Image Caption: A pit silo in Araguacema, circa 1964. This style of silage was originally conceived by Francis Morris in the 19th century.
Pilot at College Park
Society: AIAAEra: 1900sDateCreated: 1909College Park AirportCollege ParkState: MDCountry: USAWebsite: https://vtol.org/files/dmfile/AIAAHistoricSite-CollegePark2.pdfCreator: U.S. Army Signal Corps

College Park Airport was founded in 1909 when the Wright Brothers came here to train the first military officers to fly in the givernment's first airplane. The airport is the oldest continuously operated airport in the world, and has come to be known as "The Field of Firsts" due to it being the location of a great number of groundbreaking achievements, such as:

 

 

1909: First woman passenger to fly in the United States

YearAdded:
2003
Image Caption: An early pilot flying a Curtiss aircraft at College Park, 1912
NIST building
Society: ACSMain Category: ChemicalSub Category: Cradles of ChemistryEra: 1900sDateCreated: 1901National Institute of Standards and TechnologyGaithersburgState: MDCountry: USAWebsite: https://www.acs.org/content/acs/en/education/whatischemistry/landmarks/nist.html

The federal government’s first physical science research laboratory was chartered by Congress on March 3, 1901, as the National Bureau of Standards, which became the National Institute of Standards and Technology in 1988. Recognizing the critical importance of chemical measures and standards, NIST established the Chemistry Division as one of its first programs.

YearAdded:
2001
Image Caption: NIST Advanced Measurement Laboratory (AML) building Gaitherburg, MD. The NIST Advanced Measurement Laboratory building was designed by HDR Architecture Inc., and built by Clark/Gilford, Joint Venture. Construction began on the building on June 9, 2000 and it was completed by June 2004.
river blindness
Society: ACSMain Category: ChemicalSub Category: MedicalDateCreated: 1987Merck & Co., Inc.RockvilleState: MDCountry: USAWebsite: https://www.acs.org/content/acs/en/education/whatischemistry/landmarks/ivermectin-mectizan.htmlCreator: Merck Research Labs

The story is so improbable it defies belief: a soil sample from Japan stops suffering in Africa. It starts when a scientist discovers a lowly bacterium near a golf course outside Tokyo. A team of scientists in the United States finds that the bacterium produces compounds that impede the activity of nematode worms. It is developed into a drug that wards off parasites in countless pets and farm animals, averting billions of dollars in losses worldwide.

YearAdded:
2016
Image Credit: Courtesy Wikicommons/현태웅 (CC BY-SA 4.0)Image Caption: A young man affected by onchocerciasis - river blindness
Bollman Truss Bridge
Society: ASCEMain Category: CivilSub Category: Bridges, TransportationEra: 1860-1869DateCreated: 1869Little Patuxent RiverSavageState: MDCountry: USAWebsite: http://www.asce.org/Project/Bollman-Truss-Bridge/Creator: Bollman, Wendel

The design of the Bollman Truss Bridge-patented in 1852 and one of the first to use iron exclusively in all essential structural elements-was critical in the rapid expansion of American railroads in the 19th century. Replacing wooden bridges, which  were cumbersome to build and vulnerable to decay, the Bollman Truss Bridge could be built relatively quickly and inexpensively, while providing the long-lasting qualities associated with metal. This allowed new rail lines to be built over long distances in a short period of time.

YearAdded:
1966
Image Credit: Courtesy Flickr/Andrew Bossi (CC BY-SA 2.0)Image Caption: Bollman Truss Bridge as it looks today, after the repairs done in 1934-84.Era_date_from: 1869
Thomas Viaduct Railroad Bridge
Society: ASCEMain Category: CivilSub Category: Roads & RailsEra: 1830-1839DateCreated: 1835Patapsco RiverArbutusState: MDZip: 21227Country: USAWebsite: http://www.asce.org/Project/Thomas-Viaduct-Railroad-Bridge/Creator: Latrobe II, Benjamin Henry, McCartney, John

Opened in 1835, the Thomas Viaduct was the first multiple-arch, stone railroad viaduct in the United States. The viaduct is composed of eight arches each with a clear span of about 58 feet. The viaduct has an overall length of 614 feet and a height of about 60 feet above the Patapsco River. Construction of the viaduct began in August of 1833, and a ceremony marking its completion was conducted on July 4, 1835. The viaduct was constructed for the Baltimore and Ohio (B&O) Railroad and is named in honor Philip E. Thomas, who served from 1827 to 1836 as the first president of the B&O.

YearAdded:
1964
Image Credit: Public Domain (National Park Service)Image Caption: Thomas Viaduct Railroad BridgeEra_date_from: 1835
NS Savannah
Society: ASMEMain Category: MechanicalSub Category: Water TransportationEra: 1960-1969DateCreated: 19624601 Newgate AveBaltimoreState: MDZip: 21224Country: USAWebsite: https://www.asme.org/about-asme/who-we-are/engineering-history/landmarks/87-ns-savannahCreator: New York Shipbuilding Corporation, Babcock & Wilcox Company

The N.S. Savannah was the first nuclear-powered cargo-passenger ship, built by the New York Shipbuilding Corporation at Camden, New Jersey. The 74 maximum-power thermal megawatt pressurized-water reactor was supplied by the Babcock & Wilcox Company. Nearly 600 feet long with 22,000-tons displacement, the ship at top speed surged along at 24 knots, with more than 22,300 shaft horsepower to a single propeller. A joint venture by the U.S. Maritime Administration and the Atomic Energy Commission to the design of George G. Sharp Inc.

YearAdded:
1983
Image Credit: Public Domain (U.S. Government)Image Caption: NS SavannahEra_date_from: 1962
Society: ASMEMain Category: MechanicalSub Category: Minerals Extraction & RefiningEra: 1800-1829DateCreated: 1828Furnace Town Living Heritage MuseumSnow HillState: MDZip: 21863Country: USAWebsite: http://www.asme.org/about-asme/history/landmarks/topics-m-z/minerals-extraction-and-refining/-159-nassawango-iron-furnace-%281828%29Creator: Maryland Iron Company
This furnace was the focal point of a pre-Industrial Revolution industry town, one of hundreds of furnaces that thrived and failed in the 19th century. The Maryland Iron Company (incorporated 1828) built this furnace along the Nassawango Creek roughly four miles northwest of the Pocomoke River to produce pig iron by the cold-blast process. In 1836-37 the furnace changed ownership several times, until Thomas Spence of Worcester County purchased it and began producing pig iron at a rate of 700 tons a year. Spence is credited with the installation of the hot-blast stove.
YearAdded:
1991
Image Credit: Public Domain (National Park Service)Image Caption: Nassawango Iron FurnaceEra_date_from: 1828
Deciphering the Genetic Code
Society: ACSMain Category: ChemicalSub Category: Frontiers of KnowledgeEra: 1960-1969DateCreated: 1961NIH Mark O. Hatfield Clinical Research CtrBethesdaState: MDZip: 20892Country: USAWebsite: https://www.acs.org/content/acs/en/education/whatischemistry/landmarks/geneticcode.htmlCreator: Nirenberg, Marshall

In 1961, in the National Institutes of Health Headquarters (Bethesda, MD), Marshall Nirenberg and Heinrich Matthaei discovered the key to breaking the genetic code when they conducted an experiment using a synthetic RNA chain of multiple units of uracil to instruct a chain of amino acids to add phenylalanine. The uracil (poly-U) served as a messenger directing protein synthesis. This experiment demonstrated that messenger RNA transcribes genetic information from DNA, regulating the assembly of amino acids into complex proteins.

YearAdded:
1997
Image Credit: Courtesy Wikipedia/Infocan (CC BY-SA 3.0)Image Caption: Deciphering the Genetic CodeEra_date_from: 1961
Druid Lake Dam
Society: ASCEMain Category: CivilSub Category: DamsEra: 1870-1879DateCreated: 1871Druid Hill ParkBaltimoreState: MDCountry: USAWebsite: http://www.asce.org/Project/Druid-Lake-Dam/Creator: Martin, Robert

Like other American cities in the late 19th century, Baltimore had grown so quickly its supply system was unable to provide city residents with a dependable supply of water. Two reservoirs built outside the city helped increase capacity, but heavy rainfalls in the largely agricultural area tended to foul this additional water supply. City officials elected to construct a holding reservoir within the city - contained by an earthen dam - where silty water would be allowed to settle. No such project had ever been undertaken in the United States.

YearAdded:
1971
Image Credit: Courtesy Flickr/Jeff Covey (CC BY-SA 2.0)Image Caption: Druid Lake DamEra_date_from: 1871
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