Early photographers used flash powder when they made a photograph. It was common until the 1920s to use a magnesium based substance to create light. Before flash lights were built into cameras, you had lots and lots of different types of flash that needed to be mounted on top of the camera. Taking a picture with flaslight was pretty expensive, some bulbs only lasted one exposure. This flash bulb is probably from the 1960s, it’s called an AG-1 bulb (AG means all glass) and used wires.
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