The product comprises a light bulb attached to a pencil which is used to draw on a metal plate. The light bulb is connected to the pencil with a small battery in the pencil, so that when the pencil touches the plate, the electric circuit is completed to make the light glow.
In this way, whatever is drawn on the metal plate is also "drawn" in light with a long exposure photograph.
Typically the metal plate sits on an easel, with a camera looking down at the easel, and the camera's shutter is also connected so that it opens automatically when a "light drawing" is made.
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