Some of the "amplifying telephone" equipment that carried audio from the Nov. 11, 1921, Armistice Day ceremony at Arlington National Cemetery, where Warren Harding spoke over the casket of the Unknown Soldier, to loudspeakers set up for the crowds outside as well as in New York and San Francisco. More here.
November 1921. "This is the delicate machinery being installed beneath the Arlington Amphitheater which will amplify the President's voice one thousand billion times when he makes his address on Armistice Day in honor of America's Unknown Warrior." Harris & Ewing Collection glass negative.
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