'Mazda' tungsten filament bulb, ca. 1935

Contributed by Maine Historical Society

'Mazda' tungsten filament bulb, ca. 1935

Purchase a reproduction of this item on VintageMaineImages.com.

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.

View/Add Comments

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
Website

Cross Reference Searches

LC Subject Headings


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.