 Complete the following phrase:  The earliest literary reference to a water-driven, compartmented wheel appears in the technical treatise Pneumatica chap. 61 of the Greek engineer Philo of Byzantium ca. 280220 BC. In his Parasceuastica 91.4344, Philo advises the use of such wheels for submerging siege mines as a defensive measure against enemy sapping. Compartmented wheels appear to have been the means of choice for draining dry docks in Alexandria under the reign of Ptolemy IV 221205 BC. Several Greek papyri of the 3rd to 2nd century BC mention the use of these wheels, but dont give further details. The non-existence of the device in the Ancient Near East before 