Alexander Graham Bell (1847-1922), US inventor, with his wife Mabel (1857-1923, nee Hubbard) and their daughters Elsie May Bell (1878-1964, left) and Marian Hubbard Bell (called Daisy, 1880-1962, centre). Bell is most famous for his development of the telephone, although he also worked on acoustics and communication methods for the deaf. Mabel, who was deaf, was one of his pupils. They married in 1877. Photographed around 1885.