Historical Marker

First Atomic Clock, 1948

Historical marker location:
4000 Connecticut Ave Northwest, Forest Hills, District of Columbia
( Marker is at the intersection of Connecticut Avenue Northwest and Upton Street Northwest, on the right when traveling south on Connecticut Avenue Northwest.)
Marker installed: 2017

IEEE Milestone

Washington, D.C. is 90 square miles, surrounded by reality.
Andrew Johnson in The Public Papers of the Presidents, 1865
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