National Geographic : 1947 Mar
Miracle Men of the Telephone 287 Gilbert Urosvenor Dr. Bell Lends a Hand in Hauling Down One of His Big Man-lifting Kites This is the same type of kite that lifted Lt. Thomas E. Selfridge, U. S. Army, to a height of 168 feet in 1907. It is built of tiny tetrahedral, or four-sided, cells, each of the four sides being triangular, a shape which provides great strength. Dr. Bell experimented with various kinds of kites at his summer home at Baddeck, seeking to solve problems of flight. A grandson, Melville Bell Grosvenor, aids in the foreground.