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- MMN #74871
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Description
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.
About This Item
- 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 Company collection
- Object Type: Physical Object
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Maine Historical Society485 Congress Street, Portland, ME 04101
(207) 774-1822 x230
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