Taking the "X" out of X-Rays

"Taking the X out of X-Rays" is a 1940s General Electric film, featuring Dr. William D. Coolidge, that explains the invention and operation of the hot-cathode X-ray tube. This innovation removed the "unknown" (X) variable from earlier, unstable cold-cathode tubes, allowing for safe, predictable, and precise medical imaging, say Wikipedia and Columbia University Department of Surgery. 

Sponsored by General Electric, this is a short film featuring Dr. William Coolidge (circa 1940), the inventor of the Coolidge X-ray tube, also called hot cathode tube. He discusses medical imaging and demystifies X-rays.

Courtesy of Prelinger Archives