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Microphone Month

Edison Effect

In 1883, Thomas Edison noticed that heating certain materials could cause them to emit electrons that could be attracted to an electrode held at a positive potential with respect to the emitter, especially when the electrodes were in a vacuum. This became known as the Edison effect and according to Edison, was discovered by accident when experimenting with his new invention, the incandescent lamp. Twenty years later, this effect became the basis for inventing the vacuum tube.

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