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https://www.linkedin.com - During his lifetime, Ctesibius is credited with the invention of the Hydraulis (circa 270 B.C), conducted siphon experiments that advanced steam mechanics further with a broad array of devices created by Hero of Alexandria (10-70 A.D). He is credited with having invented the first “toothed wheel” found in his water clock invention, and may have been the director of the Engineering School of Alexandria during the time of Ptolemaîos Philádelphos (who reigned from 283 to 246 B.C).