'Mazda' tungsten filament bulb, ca. 1935
Contributed by Maine Historical Society
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The "ductile tungsten" filament, developed by William D. Collidge in about 1911, is the method still used in incandescent bulbs.
Tungsten is sintered (heated and pressed) and forced through increasingly small dies, which produces a wire that is flexible, but strong.
This bulb has frosted glass, a process developed in 1925 to reduce glare.
- Title: 'Mazda' tungsten filament bulb, ca. 1935
- Creator: General Electric Co.
- Creation Date: circa 1935
- Subject Date: circa 1935
- Media: Glass, tungsten, brass
- Local Code: 2004.090.4295
- Collection: Central Maine Power Co.
- Object Type: Physical Object
For more information about this item, contact:
Maine Historical Society
489 Congress Street, Portland, ME 04101
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