![Tesla at a banquet](/sites/default/files/styles/default_extra_large/public/theme-images/hero-images.jpg?itok=vaECt2og)
Nikola Tesla Images and Photographs
Images and photographs of, or related to, Nikola Tesla
Illustration of method for improved double-focus x-ray tube
Fig. 3. — Illustrating Arrangement with Improved Double-Focus Tube for Reducing the Injurious Actions.