
On 2 August 1922 Alexander Graham Bell, the inventor of the telephone, died.
Although he is best known for this invention Bell was also well known for his work on deafness, including teaching a young Helen Keller. His work in this field was a continuation of that which had been begun by his father, Alexander Melville Bell, who developed Visible Speech, a method of teaching speech to the deaf. Bell also invented an air-cooling system, a way of desalinating sea-water and a sorting machine for punch-coded census cards. Later in life he also became interested in aeronautics, inventing several large kites capable of carrying the weight of a human and producing a hydrofoil craft in 1919 that managed to reach the speed of 70 mph.

