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An analogue computer is a device that uses its innate physical properties to model a system or problem and make predictions. For example, a system of gears might be used to translate the speed a crank turns to the movement of a needle on a dial. The computer preforms a calculation automatically, without thought or process, without manipulating a single number, based solely on the very facts of its existence: the sizes, weights and shapes of its components, and their relationships to one another. The gears know nothing about anything other than themselves, but correctly arranged, they can reveal the truths of the universe that made them, the rising and falling of the tides, the laws of flight, the steady motions of the stars we look up to each night.

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