The Date of Ctesibius

Tsc question of the date of Ctesibius has been much obscured of late years by those German scholars1 who assert that Ctesibius the pneumatic and hydraulic engineer mentioned by Vitruvius IX. 8. 2 is distinct and separate from Κτησίβιος Κτησίβιος μηΧανικός who is mentioned by Athenaeus Mechanicus (Βελοπιικά, p. 8, Thevenot), Philo of Byzantium (pp. 56, 67, 72, 77, Thevenot), and Hedylus ap. Athenaeum Naucratitam Deipn. XI., p. 497, d-e = Anthologia Graeca ed. Cougny, Paris (Didot), 1890, Vol. III., p. 298, n. 67.