Lesson 15-The riddle of time .evelopment of Clocks-Water Clocks x Water clocks were among the earliest timekeepers that didn't depend on the observation of celestial bodies. One of the oldest was found in the tomb of the Egyptian pharaoh Amenhotep I, buried around 1500 BC. Later named clepsydras c water thieves") by the greeks, who began using them about 325 BC, these were stone vessels with sloping sides that allowed water to drip at a nearly constant rate from a small hole near the bottom. other clepsydras were cylindrical or bowl-shaped containers designed to slowly fill with water coming in at a constant rate W BT E To be continued on the next page.Lesson 15—The Riddle of Time W B T L E Water clocks were among the earliest timekeepers that didn’t depend on the observation of celestial bodies. One of the oldest was found in the tomb of the Egyptian pharaoh Amenhotep I, buried around 1500 BC. Later named clepsydras (“water thieves”) by the Greeks, who began using them about 325 BC, these were stone vessels with sloping sides that allowed water to drip at a nearly constant rate from a small hole near the bottom. Other clepsydras were cylindrical or bowl-shaped containers designed to slowly fill with water coming in at a constant rate. To be continued on the next page. I. Development of Clocks—Water Clocks