The Tetrahedral Kites of Dr Alexander Graham Bell

 

 The Tetrahedral Kites of Dr Alexander Graham Bell  

The Alexander Graham Bell Family Papers

Alexander Graham Bell 

 Drawing of telephone

 Bell's notebook entry on March 10, 1876, the day of the first phone call.

Alexander Graham Bell

 Alexander Graham Bell provided assistance for the Keller family

 Alexander Graham Bell worked on developing a metal detector when President Garfield was shot.

 

Many of Bell's early phones are shown here.

 Bell was interested in aviation and worked with others to develop flying machines.

 In 1864, Alexander Graham Bell's father, Alexander Melville Bell, developed the system called visible speech to help deaf people learn to speak normally.

Telegraph,

 

Bell calling Chicago in 1892.

 

The Cygnet (or Aerodrome #5) was an extremely unorthodox early Canadian aircraft, with a wall-like “wing” made up of 3,393tetrahedral cells. It was a powered version of the Cygnet tetrahedral kite designed by Dr Alexander Graham Bell in 1907 and built by the newly-founded Aerial Experiment Association.

More info: Wikipedia