• Post Reply
  • Bookmark Topic Watch Topic
  • New Topic

re-usable incandescent lights

 
paul wheaton
steward
Pie
Posts: 18687
Location: missoula, montana (zone 4)
bee chicken hugelkultur trees wofati woodworking
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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?

 
                            
Posts: 29
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
i would imagine the filament is the most expensive part
 
                                
Posts: 25
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
i wonder how they pulled the vacuum needed ?
 
tel jetson
steward
Posts: 3346
Location: woodland, washington
75
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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.
 
                    
Posts: 0
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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.
 
kent smith
Posts: 211
Location: Pennsylvania
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
just a wild guess, but were they carbon arc lights?
kent
 
                    
Posts: 0
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
 
2016 Permaculture Design Course at Wheaton Labs http://richsoil.com/pdc
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic