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Edison, seated at a cluttered table, peers through a microscope.

Edison examining the surface of a diamond disc record, about 1916

One of the more difficult adjustments for Edison to accept proved to be the commercial success of flat phonographic discs, which ultimately displaced his cylinders.

SI negative #87-1638

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The Challenge of Success
Before Forty
Changes At Forty
Home Life
The New Technical World
Fame And Its Distractions
Edison In His Eighties