Marker Logo HMdb.org THE HISTORICAL
MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Pittsburgh in Allegheny County, Pennsylvania — The American Northeast (Mid-Atlantic)
 

Langley Observatory Clock

 
 
Langley Observatory Clock Marker image. Click for full size.
By Mike Wintermantel, October 29, 2014
1. Langley Observatory Clock Marker
Inscription.  The title of the sculpture, Langley Observatory Clock, refers to the work of Samuel P. Langley. In 1870, Langley, director of the Allegheny Observatory, created the Allegheny System - a standardized system of measuring and disseminating accurate time. Langley used the observatory telescope and astronomical observations to set the time on a specifically designed clock. Using telegraph wires, Langley connected the observatory clock to a highly visible clock located at Pittsburgh's City Hall on Smithfield Street. By the end of the year, 42 railroads were provided a standard time through this system.
 
Topics. This historical marker is listed in these topic lists: Air & SpaceRailroads & StreetcarsScience & Medicine. A significant historical year for this entry is 1870.
 
Location. 40° 26.706′ N, 80° 1.013′ W. Marker is in Pittsburgh, Pennsylvania, in Allegheny County. Located on the North Shore Trail between The Carnegie Science Center and Heinz Field. Touch for map. Marker is in this post office area: Pittsburgh PA 15212, United States of America. Touch for directions.
 
Other nearby markers. At least 8 other markers are within walking distance of this marker. Three Rivers Heritage Trail (about 400 feet away, measured in a direct line); The Pittsburgh Point
Langley Observatory Clock Marker image. Click for full size.
By Mike Wintermantel, October 29, 2014
2. Langley Observatory Clock Marker
Located in front of sculpture
Click or scan to see
this page online
(about 400 feet away); Three Rivers Stadium (approx. 0.2 miles away); County of Allegheny Law Enforcement Officers Memorial (approx. 0.2 miles away); First Professional Football Game (approx. 0.2 miles away); The Immaculate Reception (approx. ¼ mile away); Southwestern Pennsylvania World War II Memorial (approx. ¼ mile away); Mary Cassatt (approx. 0.3 miles away). Touch for a list and map of all markers in Pittsburgh.
 
 
Credits. This page was last revised on June 16, 2016. It was originally submitted on October 30, 2014, by Mike Wintermantel of Pittsburgh, Pennsylvania. This page has been viewed 404 times since then and 22 times this year. Photos:   1, 2. submitted on October 30, 2014, by Mike Wintermantel of Pittsburgh, Pennsylvania.

Share this page.  
Share on Tumblr
m=78391

Paid Advertisement
Sep. 19, 2021