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What is a photophone?

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Bell invented the photophone, which transmitted speech by light rays; the audiometer, another invention for the deaf; the induction balance, used to locate metallic objects in the human body; and the flat and the cylindrical wax recorders for phonographs. He investigated the nature and causes of deafness and made an elaborate study of its heredity.

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Get more facts and information about Bell, Alexander Graham . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

Similar questions: What were Alexander Graham Bell's contributions to the study of deafness? Who invented the wax cylinder method of recording sound? What is an induction balance? What is an audiometer? [ Hide these questions ]

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