National Mazda Vibration-Resistant Mill Type Light Bulb

This is an early uncoiled tungsten "rough service" bulb, called a "Mill type lamp". The filament has additional center supports in order to make it more resistant to vibration. It could also have been made this way to improve downward illumination. The entire glass post holding the filament is suspended by a short segment of "piano wire" which supposedly helped to absorb vibration, according to the publicity of the time.

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