Contributed by Maine Historical Society
Purchase a reproduction of this item on VintageMaineImages.com.
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
For more information about this item, contact:Maine Historical Society
485 Congress Street, Portland, ME 04101
(207) 774-1822 x219
Please post your comment below to share with others. If you'd like to privately share a comment or correction with MMN staff, please use this form.