The Progress of Invention in the Nineteenth Century.
CHAPTER XXV.
THE ROENTGEN OR X-RAYS.
Geissler Tubes. Vacuum Tubes of Crookes, Hittorf, and Lenard. The Cathode Ray. Roentgen’s Great Discovery in 1895. X-Ray Apparatus. Salvioni’s Cryptoscope. Edison’s Fluoroscope. The Fluorometer. Sun- burn from X-Rays. Uses of X-Rays.