Maker's Name: 
Western Electric
Where made: 
15 × 14 × 9 cm

Small low-powered cavity Magnetron. This has a diode structure, with several cavities in the anode, tuned for the Radar X-band. The spiralling electrons travelling from the central filament to the anode thru a transverse magnetic field (the magnet required is not with the device) give up energy as they travel past the anode cavities, and shock the cavities into oscillation. The RF energy is transferred from one of the cavities thru a pickup loop to the waveguide attached to the anode structure.