Information Sheet
Rating: unknown (110v 40w?)

Came from: U.S.A.

Manufactured: 1909-1922 (est. 1915)

Purchased: January 2003

Price paid: $35 plus sh.

Estimated value:
$30+ in good working condition

Bulb rarity: very rare

Features: True Blue glass


Tipped Cobalt Blue Edison Mazda Lightbulb

This is a cobalt blue, cage filament, Edison Mazda lightbulb. This is the tipped variant, and it is VERY scarce. The little glass tip on top tells us that this bulb was made before 1922. Bulbs like these were commonly used for theater stage illumination. This bulb is made with true tinted glass (not painted).

The filament style present in this bulb is called a "cage filament", and is made of an uncoiled tungsten wire. It is supported by a glass rod with several hooks on it. The usual amount of hooks is 10, but there can be many more, especially in the case of 220 volt bulbs which require a longer tungsten wire. People often find this type of filament hard to describe. It is simply a very long continuous filament, not multiple filaments as most people usually (mistakenly) say.

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