Alexander Graham Bell
From the to floor of this building
was sent on June 3, 1880
over a beam of light to 1325 L Street,
the first wireless telephone message
in the history of the world.
The apparatus used in sending the message
was the photophone invented by
Alexander Graham Bell,
inventor of the telephone
This plaque was placed here by
Alexander Graham Bell Chapter
Telephone Pioneers of America
March 3, 1947
The Centennial of Dr. Bell's Birth
Marker is at the intersection of 13th Street NW and K Street NW, on the right when traveling north on 13th Street NW.
Courtesy hmdb.org
