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Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Many use lightbulbs as current limiters. But before instruments, (meters) were cheap and available, especially AC meters, lamps were used to test circuits with coils and capacitors by looking at the brightness. Every motor shop had a lamp-board to ring out and phase windings during rewind repairs. Moreover, both tungsten and carbon filament lamps were available. (carbon has the inverse temp/resistance ) of tungsten. If you are going to be around a while, hoard up a stash of incands; soon they will be hunted to extinction. Lamps were used tp phase in water wheel turbines, and were more trusted than syncroscopes which could fool you into an embarassing substation trip.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
What? They are 4 for $1 at my local store.
What is really hard to find is neon indicator lamps. I'm lucky enough to have 5 GE NE-34 indicators from the 30's. I was thinking of making a VU meter with them.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
The NE34 VU could look great with some AR1s added, 5 NE34, 5 AR1. Yes, 20 cents for incands is common, Walmart was selling 4 for 68 cents in a box a while ago. The hard ones to find now are the S-1 tungsten and the carbon with the seal tip on top. Ferrowatt has some nice repros.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Yeah, but the only AR1's i can find are being sold for $14 each. That's not going to happen :p 7 bucks maybe. The AR-1s were made in quantities nearly 100x larger than the ne-34's. The were sold to consumers as personal sources of ultraviolet radiation, while the ne-34's were only used as indicator lamps. It's very hard to come across them, especially pristine ones.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
NE34S are being at $37. someone has 200 for sale. My stash of NE 34s is rather scant. AR1 better. AR1's were sold as night lights and rock hounds used them as a UV source. They dont last long, and the bulb blackens. Here is a store counter top display of AR1s . The date code looks like 1964. The boxes of 10 came in a caselot of 10 boxes for a total of 100 lamps. Happily I snagged a case.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
The direness of stocking up on incandescents depends on your location, in California it is almost illegal to install a normal screw in base lamp (not till 2012 at least, the current laws only require xx% of high efficacy lamps depending on the room)--lucky they haven't talked of banning the sale of replacement bulbs yet.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
much of a problem for at least 30 years though.
thinking like that led many to regret not saving the carbon bulbs when tungsten came along...now these 90 volt 4 candlepower lamps shipped from Berlin in 1908 are *almost* impossibe to find.
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Light bulbs as testers.
