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re-usable / repairable incandescent lights

 
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A friend of mine told me about how boats long ago used incandescent bulbs that were re-usable. The bulbs all had a way of opening them up and replacing the filament. And the boats carried a light bulb repair kit, complete with a bunch of filaments. Imagine: a light bulb that lasts forever. You just have to mend it with a bit of filament every couple of years. Maybe filaments come in 100 packs for $5.

Anybody know of anything like that existing today?  Anybody know of a web page that talks about the old stuff?

 
                            
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i would imagine the filament is the most expensive part
 
                                
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i wonder how they pulled the vacuum needed ?
 
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joan from zone 6 wrote:
i wonder how they pulled the vacuum needed ?



I think incandescent bulbs are filled with inert gas.  maybe there's a vacuum, too.  some high intensity discharge lamps involve vacuums.  maybe I have no idea what I'm talking about.
 
                    
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The earliest bulbs used a vacuum. Early in the 1900's someone discovered that using an inert gas made the lamp brighter and reduced darkening of the inside of the glass.

Because of the need for either a vacuum or insert gas or at least the absence of oxygen I have trouble understanding why a rebuildable light bulb would have ever been developed or made practical. If there really was such a thing it would be very interesting to see an example and the rebuild kit.
 
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just a wild guess, but were they carbon arc lights?
kent
 
                    
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machinemaker wrote:
just a wild guess, but were they carbon arc lights?
kent



There ya' go, but a totally different thing. Never thought of those, Thanks kent
 
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I just stumbled onto this old thread and thought I would give it a bump.   Anybody have any stories, pictures, videos ...  anything?
 
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