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Galileo, like other philosophers, was skilled in inventing instruments for research. In 1599, he hired a skilled workman to live with him and test the devices he created. Like many other philosophers who have greatly extended our knowledge of nature, Galileo had a remarkable aptitude for the invention of instruments designed for philosophical research. To facilitate his practical work, we find that in 1599 he had engaged a skilled workman who was to live in his house and be constantly at hand to try the devices which were forever springing from Galileo's fertile brain.