Abstract: A method of eliminating discomforting flickering when viewing X-ray films in a light cabinet using fluorescent lamps, and a flicker-eliminating circuit for use in the light cabinet.

Abstract: A counter-balanced radiography unit stand comprises a column on which a wing arm bearing the radiography equipment is mounted for vertical displacement and rotary movement. Automatically applied brakes for stopping the vertical displacement and the rotary movement, respectively, are electromagnetically releasable by electrically controlled actuating devices, which when approached or contacted by, for example, the hand of an operator, release the corresponding brake so that the swing arm can be rotated and/or displaced. At least one actuating device for releasing the rotary movement brake and/or the vertical displacement brake is so disposed along a substantial part of the swing arm length, that easy reach of the device is accomplished by a person positioned anywhere in the region of the swing arm.The said actuating device may comprise at least one handle disposed on the swing arm.