An 1896 photograph of Wilhelm Conrad Rontgen who is credited with discovering X-rays.

The original radiograph of Frau Rontgen's hand.

Antione Henri Becquerel, discoverer of radioactivity, in his laboratory.

The photographic print and scetch documenting Becquerel's discovery of radioactivity in 1896.

A 1904 radiograph of a mole.

An 1896 radiograph of two fish.

An 1897 short-exposure radiograph of a snake.

An early radiograph of shotgun pellets embedded within a young crocodile.

A 1904 arteriogram of the human head.

A 1904 arteriogram of the human hand.