Highly evacuated electron tube for determining the wavelength of electrons as a function of the anode voltage from the radii of the diffraction rings and the distance between the lattice planes of graphite (Debye-Scherrer-diffraction) and rendered visible on a fluorescent screen. Also intended for determining the wavelengths of monochromatic radiation at different anode voltages from the radii of the diffraction rings and the lattice plane spacing of graphite, as well as confirming de Broglie’s hypothesis.

• Lattice constant of graphite: d10 = 0,213 nm, d11 = 0,123 nm

Filament voltage: 6,3 V AC; Max. anode voltage: 5000 V; Focussing voltage: 0 to 50 V