July 7, 1908 Alexander Graham Bell (right) and his assistants observe the flight of a circular tetrahedral kite. - from our story 'Alexander Grahm Bell’s Space-Age Tetrahedral Kites'

July 7, 1908 Alexander Graham Bell (right) and his assistants observe the flight of a circular tetrahedral kite.

July 7, 1908 Alexander Graham Bell (right) and his assistants observe the flight of a circular tetrahedral kite.

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