Several dozen U. S. hospitals have X-ray machines transforming 400,000 volts of electricity into X-rays for the treatment of cancer. Half-a-dozen have machines ranging from 600,000 to 1,200,000 volts. Last week the man most responsible for the development of vacuum tubes which accomplish those tremendous transformations of energy, Dr. William David Coolidge of General Electric Co., reminded the Fifth International Congress of Radiology in Chicago that Massachusetts Institute of Technology has a 5,000,000-volt generator which could be adapted for X-ray work, told them that an experimental 10,000,000-volt generator exists, promised them...
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