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View of the interior of one of the over 30 bakeries that have been discovered at Pompeii. The red brick structure on the right is the oven in which the bread was baked. On the left are two industrial–grade wheat grinders.
The grinders are composed of a black volcanic stone that has a rough surface. They are "hour–glass" in shape and are placed upon stationary stone cones. The hour–glass upper portion is turned by animals or humans, grain is placed into the top of it, and then the ground flour comes out the bottom.