Alexander Graham Bell sitting in tetrahedral chair

Alexander Graham Bell sitting in tetrahedral chair

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Credit: LIBRARY OF CONGRESS/SCIENCE PHOTO LIBRARY

Caption: Alexander Graham Bell (1847-1922) sitting in his tetrahedral chair. Most famous for his invention of the telephone, Bell was also fascinated by the theory of engineering structures and flight. He championed the cause of tetrahedral structures, frameworks based on a series of interlocked tetrahedrons (four-sided solids, each side an equilateral triangle). He is seen here watching trials of his kite designs. He was much involved with aviation pioneers, being a member of the Aerial Experiment Association with such men as Langley and Curtiss. A similar vein of research ended up with the world's first hydrofoil boat which was capable of speeds of 114 km/h.

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Keywords: alexander graham, bell, chair, portraits, surname b, tetrahedral, tetrahedral chair

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