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1842

The Cincinnati Observatory
Society: AIAAMain Category: Aerospace & AviationSub Category: AstronomyEra: 1840-1849DateCreated: 18423489 Observatory PlCincinnatiState: OHCountry: USAWebsite: https://www.aiaa.org/uploadedFiles/About-AIAA/Governance/GovernanceDocs/AnnualReports/AIAA_AnnualReport_2007-2008.pdf

The Cincinnati Observatory, “The Birthplace of American  Astronomy,” is the oldest professional observatory in the United States.  Ormsby MacKnight Mitchel, the “Father of American Astronomy,” founded the  observatory in 1842.  John Quincy Adams laid the cornerstone  for the observatory on Mt. Ida, later renamed Mt. Adams. The  original Merz und Mahler 11-inch refractor telescope was put into service  in 1845 and is still in use here today on Mount Lookout.

Image Credit: Courtesy Wikicommons/Joe D. Good (CC BY-SA 4.0)
Croton Water Supply System
Society: ASCEMain Category: CivilSub Category: Water Supply & ControlEra: 1840-1849DateCreated: 1842Croton RiverNew YorkState: NYCountry: USAWebsite: http://www.asce.org/project/croton-water-supply-systems/Creator: Jervis, John

Inferior water and the lack of a sufficient water supply prompted public pressure to find a significant water source for the 360,000 of people living in New York City at the time. Studies determined that the Croton River, 40 miles north of the city, was the best available source. The original system served as a prototype for large-scale water supply projects across America. 

YearAdded:
1975
Image Credit: Courtesy Flickr/Otterman56 (CC BY 2.0)Image Caption: Croton Water Supply SystemEra_date_from: 1842
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