Maine Memory Network
Maine's Online Museum

Login · My Account · Show Album


 

 

'Mazda' tungsten filament bulb, ca. 1935

'Mazda' tungsten filament bulb, ca. 1935

Item 74871 zoom send e-card Share this on Facebook Share this on Twitter

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.

Go back