was experimenting with electrical "rays" being emitted from a cathode ray tube of the kind created by Crookes and Thomson. Although the tube he used was covered in black paper and the room was dark, Rontgen saw that a screen coated with phosphorescent material was glowing.
Rontgen reasoned that there must be a "ray" that could pass through the paper.
He later discovered that these "rays" could travel through many materials as well as flesh. In fact, the first image he made using these "X-rays" was of his wife's hand, showing her wedding ring.
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