A X-ray tube is mounted on the same mobile base as its power supply which includes a pair of motor driven flywheels. The motors can be run from 120 volt outlets to bring the flywheels to a predetermined speed. The motors are then shut off and the flywheels drive electric generators. A motor controlled variac maintains the power output of the generators constant as energy is drawn from the flywheels and they slow down. The power output is switched through a step-up transformer and a rectifier to the load of the X-ray tube. The two flywheels are equal and opposite in angular momentum by counterrotation and therefore cancel the effect precessional or other movement to the mobile base when energy is drawn from them.
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