Hammer, William J.

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Hammer, William J.

American engineer

Learn about this topic in these articles:

associaton with Edison

In Thomas Edison: The electric light
In 1881–82 William J. Hammer, a young engineer in charge of testing the light globes, noted a blue glow around the positive pole in a vacuum bulb and a blackening of the wire and the bulb at the negative pole. This phenomenon was first called “Hammer’s phantom…
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