"X-ray photography" Quotes from Famous Books
 ... discovered by Roentgen in 1896 and they have been studied and applied very widely ever since. Their great use has been in X-ray photography, but they are also being used in therapeutics. The extreme ultra-violet rays are not available in sunlight and are available only near a source rich in ultra-violet rays, such as the arc-lamps. They are absorbed by air, so that they are studied in a vacuum. These are the rays which convert oxygen ...
— Artificial Light - Its Influence upon Civilization • M. Luckiesh |
