Caption:
Two hands, viewed by x-ray. Photoprint from radiograph, after Sir Arthur Schuster, 1896. German physicist Wilhelm Rontgen is usually credited as the discoverer of x-rays in 1895, because he was the first to systematically study them, though he is not the first to have observed their effects. He is also the one who gave them the name "x-rays" (signifying an unknown quantity) though many others referred to these as "Rontgen rays" (and the associated x-ray radiograms as, "Rontgenograms" for several decades after their discovery.