BULB DISCUSSION BOARDS > Antique Bulb Discussion

Need help identifying buld

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mhonings:
Found this in an old barn, looking for any information I can get on it. I can't find any marking.

adam2:
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.

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