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After inventing the telephone, bell continued his experiments in communication, which culminated with the photophone transmission of sound on a beam of light, a precursor of today's optical fiber … In june, bell demonstrated the telephone for sir william thomson (baron kelvin) and emperor pedro ii of brazil at the centennial exhibition in philadelphia. On july 9, 1877, bell, hubbard, sanders, and …
He emigrated to canada in 1870 and then to the united states in 1871.
