BulbCollector Forums
BULB DISCUSSION BOARDS => Antique Bulb Discussion => Topic started by: mhonings on July 26, 2020, 02:48:53 pm
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Found this in an old barn, looking for any information I can get on it. I can't find any marking.
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Looks like a relatively high power carbon filament bulb. Known as a "concentrating filament" type.
Viewed from the correct angle, the filament appears to occupy a relatively small area.