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X-ray Geissler Crookes Radio Box art
Dr. Hugh Hicks Fort Myers, FL. S.Slabyhoudek
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The packaging looks modern but the design is old (drawn tungsten cage filament), so I'm a bit confused, not to mention the odd vacuum tube / valve-like 4-pin base. Sorry, I don't have an answer on this one. Maybe someone else will recognize it. Interesting bulb though!
That lamp seems to be single filament because it has only two lead-in wires going in from stem; also is fitted with regular modern exaust tube in the downside of the globe through the stem. The purpose of have choosen a 4 pin radio tube socket? it remains in the darkness; maybe to avoid the unscrewing of the whole bulb due to ship vibrations if it were fitted with a regular Edison base, the same thing that is usually done in the lighting installations of railway vehicles, although for that purpose is better to use conventional bayonet sockets and caps.Another possibility is that this type of cap were chosen to use the lamp itself as any kind of dropper or absorption resistance in some type of ship's apparatus like battery chargers. It's only a guess.Pedro: where are you from? I would be interested in buying you one of these curious and a bit intriguing lamps to my own collection; please let me know.