JoeH has identified the mystery man as Washington inventor and television pioneer Charles Francis Jenkins (1867-1934), pictured here with what might be considered an early flat-panel video display, its 48-pixel-square grid composed of small neon lamps.
Washington, D.C., in 1928. "NO CAPTION" is the caption for this one; again we turn to the crowd-source wisdom of the Shorpy masses to inquire: What the heck is it? (Close-up here
.) Harris & Ewing Collection glass negative.
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