1895 · X-Ray Apparatus · Werk 226 von 1.871

Roentgen's discharge tube on a bench at the Wurzburg physical institute: an elongated glass vacuum tube with wire electrodes sealed through the glass, wires from the electrodes running to a large induction coil standing on the same bench, the whole glass tube wrapped closely in a sleeve of black cardboard that follows its shape, a small cardboard screen painted with barium platinocyanide on a stand and a photographic plate holder nearby, the room darkened.