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According to the Wikipedia link below: The Coolgardie Safe is a low-tech refrigeration unit which uses the heat transfer which occurs during evaporation of water. See the link for more. The Coolgardie Safe was commonly used in colonial Australia. It consisted of a metal "safe" with screen-wire-like holes, which was hung outside on a verandah. Food which needed to be cool was placed inside the safe. Over the safe was placed a hessian cloth, dampened, so that as the breeze blew through the cloth, it cooled down the food inside. The safe hung from the ceiling, and often had a tin cup placed around the wire from which it hung, filled with water, so that ants could not descend the wire and get to the food.

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Q: What is a Coolgardie Safe?
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