Backstory and Context
The observatory was founded by the Allegheny Telescope Association in 1859 and donated to Pitt in 1867 due to funding issues. Its first director, Sam Langley, expanded the observatory to include dark and class rooms, dorms, and a lecture hall. It was then used astronomical measurements to develop a reliable time system for, initially, the Pennsylvania Railroad and, eventually, the nation. This "Allegheny Time" system is thought to be the forerunner of the Standard Time system.
In 1872, the lens from the observatory was stolen and held for ransom. Langley refused to pay and the lens was later found in Beaver Falls, PA, about 25 miles from Pittsburgh. A new observatory (the current one) was built in 1912 and included labs, offices, classrooms, a lecture hall and three hemispherical domed telescope enclosures, two for research and one for schools and the general public. The buildings from the old observatory were torn down in the 1950s.
The observatory is now used to detect extrasolar planets. A seismic station was installed by the Department of Geology and Planetary Science in 2009 and it is open for public tours from April through October. The observatory was added to the National Register of Historic Places in 1979.
"Allegheny Observatory." University of Pittsburgh's Department of Physics and Astronomy. Updated May 12, 2016. Accessed November 7, 2016. http://www.physicsandastronomy.pitt.edu/allegheny-observatory
"Allegheny Observatory Historical Marker." Explore PA History. Accessed November 7, 2016. http://explorepahistory.com/hmarker.php?markerId=1-A-38B
Conti, John. "Allegheny Observatory Restoration Reminds of it History." Pittsburgh Tribune-Review. March 1, 2014. Accessed November 7, 2016. http://triblive.com/aande/architecture/5625167-74/observatory-allegheny-pittsburgh