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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 รขโฌยฆ 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 รขโฌยฆ
He emigrated to canada in 1870 and then to the united states in 1871.
