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4. This, however, is not the only apparatus which Ctesibius is said to have thought out, but many more of various kinds are shown by him to produce effects, borrowed from nature, by means of water pressure and compression of the air; as, for example, blackbirds singing by means of waterworks, and “angobatae,” and figures that drink and move, and other things that are found to be pleasing to the eye and the ear.
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