The true history of the traveling wave tube

@article{Copeland2015TheTH,
  title={The true history of the traveling wave tube},
  author={John A. Copeland and Andre A. Haeff},
  journal={IEEE Spectrum},
  year={2015},
  volume={52},
  pages={38-43}
}
An intense-looking young man stepped out of his engineering lab at Caltech to watch what was happening. In the university's nearby high-voltage laboratory, gigantic bolts of electricity were leaping eerily from outlandish equipment. It was 1931, and a Hollywood crew was filming the spark-filled special effects for the creation scene in Boris Karloff's first Frankenstein movie. The serious-minded young engineer loved cinema, but as he walked back to his bench in the Kellogg Radiation Laboratory… 
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