The tetrahedral principle enables us to construct out of light materials solid frameworks of almost any desired form, and the resulting structures are admirably adapted for the support of aero-surfaces of any desired kind, size, or shape.
Although best known for developing the practical telephone — for which he became the first, in 1876, to secure a US patent — the Scottish-born inventor Alexander Graham Bell is also noted for his work in aerodynamics, a rather more photogenic endeavour perhaps, as evidenced by the wonderful imagery documenting his experiments with tetrahedral kites. The series of photographs depict Bell and his colleagues demonstrating and testing out a number of different kite designs, all based upon the tetrahedral structure, to whose pyramid-shaped cells Bell was drawn as they could share joints and spars and so crucially lessen the weight-to-surface area ratio.
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