![]() ![]() ![]() Foreign Missions, State Department)ĭetails of the physical location of the plaque Left to right: Tony Ivanov, Sherrie Lyons, Carl Williams, Clark Nguyen, Kent Rochford, Back Row: Steve Jefferts, Chris Oates, Mike Lombardi, Cliff Seagroves (Director, U.S. The columns make up the border of another little park, also owned by the U. One remaining piece of the old National Bureau of Standards (NBS) campus remains, a pair of stone columns that once served as an entrance to the NBS campus (see photograph below from Google Maps, the two columns are circled in the photo). This is where the original Radio Building was located (see text below regarding original building site), 4000 Connecticut Avenue NW, Washington, DC Street address(es) and GPS coordinates of the Milestone Plaque Sitesīeside the sidewalk on the west side of Connecticut Ave, NW between Van Ness and Tilden Streets, Washington, DC. Atomic clock accuracy made possible many new technologies, including the Global Positioning System (GPS). Far more accurate than previous clocks, atomic clocks quickly replaced the Earth’s rotational rate as the reference for world time. The first atomic clock, developed near this site by Harold Lyons at the National Bureau of Standards, revolutionized timekeeping by using transitions of the ammonia molecule as its source of frequency. 7 Features that set this work apart from similar achievements.5 How the plaque site is protected/secured.4 Details of the physical location of the plaque.3 Street address(es) and GPS coordinates of the Milestone Plaque Sites.
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