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Newton Victor Ltd are an London based company that specialises in X-Ray supplies for both medical and industrial applications. This half wave rectifier was salvaged from a piece of their equipment, probably medical equipment.
In this first X-Ray image the reentrant glass envelope by the anode is visible but the insides of the anode are still obscured.
Adjusting the tonal range reveals the filament leads in the pinch and the form of the base pins. Note also the thin wire connecting the filament to the large base pins.
Increasing the intensity of the X-Ray beam starts to penetrate the anode and reveal the filament. The central support connects to one end of the helical filament. The top connection then folds back and coils round the filament before passing to the pinch. This coil will increase the rigidity of the filament connection.
A section of the above picture converted to a positive image. The glass to metal seal of the anode is also clearer.
The balloon envelope is 100 mm in diameter, and excluding the base pins is 257 mm tall.
Reference: Observation.

 

Updated July 22, 2014.
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