Show egyptian water clocks casts ot of two ancient egyptian water clocks have just been presented by the egyptian government to the science museum south kensington london england one of the clocks comes from karnak and dates from the reign of 11 II 1400 years before christ the other lh from kofu in the ptolemaic epoch from an examination of these clocks and the scale of in measurements recorded on each it appears appeals that the hour of that remote m 0 te period was a variable length being one twelfth ot of the length of the day or night of the particular time ot of the year A study of these ancient timepieces time pieces Is regarded as important in the comparison of astronomical observations ions |