Highly evacuated electron tube for demonstrating the wave nature of electrons through the observation of interference caused by passage of electrons through a polycrystalline graphite lattice (Debye-Scherrer diffraction) and rendered visible on a fluorescent screen. Also intended for determining the wavelength as a function of the anode voltage from the radii of the diffraction rings and the lattice plane spacing of graphite as well as confirming de Broglie's hypothesis.The tube uses an electron gun with an indirectly heated cathode to project a narrow converging beam of electrons through a thin layer of graphitised carbon supported on a fine mesh grid over the exit aperture of the gun. The cathode rays are diffracted in passing through the carbon layer and produce a ring pattern on the phosphor coated end of the tube. Study of the ring pattern and it's variation with different anode voltages permits the study and verification of the de Broglie's hypothesis shows the dual nature of the electron permits the calculation of the spacing of diffracting planes and suggests the probable arrangement of carbon atoms.Operating instructions supplied.Technical Specifications:Maximum filament voltage: = 7.5V AC/DCMaximum anode voltage: 5 kVAnode current: 0.15mA at 4kVLattice constant of graphite: d10 = 0.213 nm; d11 = 0.123 nmRequires the following products to operate:B8A49463 - Universal StandB8R02653 - EHT Power Supply - to power the anodeB8R05926 - Black Safety Lead - for EHT ConnectionB8R05927 - Red Safety Lead - for EHT ConnectionPP00051016 - 2mm Adaptor LeadB8G85458 - Bench Power Supply - to power the filamentStackable 4mm Plug Leads (black)Stackable 4mm Plug Leads (red)