Flash cube

Flash cube
An obsolete bulb containing four small flash bulbs built into a single unit.
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FLASH CUBE - A cube-shaped unit containing four built-in flash bulbs that automatically rotates to the next usable bulb when one is fired. When all four flash bulbs have been fired, the unit is no longer usable, and is discarded.

See also: Bulb, Flash bulb, Flash, Shape, Shutter