This site offers the text of a book by Frank Dyer and Thomas Martin published in 1929 on the inventions of Thomas Edison. This particular page discusses Alexander Graham Bell's development of the telephone and the controversy over Thomas Edison's carbon button microphone which was used in the telephone.

Concepts

inventions, inventors, alexander graham bell, thomas edison

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Additional Tags

microphone, phonograph, telephone technology, edison, thomas alva edison, technology, telephone

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Classroom Considerations

• This resource is only available on an unencrypted HTTP website.It should be fine for general use, but don’t use it to share any personally identifiable information