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Unknown bulb

 
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disemjg



Joined: 10 Jan 2002
Posts: 469
Location: Washington, DC

PostPosted: Fri Jan 23, 2004 1:37 am    Post subject: Reply with quote

I just got a great batch of old stuff, and among the flashbulbs are several samples of a bulb I have never heard of. It is a Westinghouse SM, and it is the size and bayonet base of a 25. The really weird thing is that there is no flash filament in the bulb, only two large electrodes connected by a very fine filament. They are safety coated. The only thing I can guess is that they are gas filled, and rely on the filament to ignite the gas.

Am I right?
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Les



Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI

PostPosted: Fri Jan 23, 2004 1:45 am    Post subject: Reply with quote

Yep they are gas filled have a 5 ms delay with a very short duration and not a whole lot of light, but this is what was used to freeze motion of skaters and acrobats. Sort of a disposable 285 vivtar.
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t.r.sanford



Joined: 10 Nov 2003
Posts: 812
Location: East Coast (Long Island)

PostPosted: Fri Jan 23, 2004 2:02 am    Post subject: Reply with quote

There was another 5-millisecond delay gas-filled bulb, the "SF." These were what the "F" setting on an "MXF" leaf shutter was for -- most modern shutters in the 1950s offered those choices. Indeed, the gas-filled lamps do not put out a lot of light, but the illumination rises and falls very quickly, so more light gets through the shutter at 1/400 or 1/500 second. I used them a couple of times, and they do work as advertised.
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glennfromwy



Joined: 29 Nov 2001
Posts: 903
Location: S.W. Wyoming

PostPosted: Fri Jan 23, 2004 4:58 am    Post subject: Reply with quote

SM (Speed Midget) bulbs = 3300 lumen seconds of light. Flash duration equal to 1/200 second shutter speed.
Able to stop motion if it isn't too fast. Good mostly for close up shots, 6 to 8 feet with medium speed or faster films. They don't get hot, just warm to the touch, and they turn white when fired. I have a whole case of the things but have no idea why.

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Glenn

"Wyoming - Where everybody is somebody else's weirdo"
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