Monday, February 10, 2014
"In ancient times, the best timepiece was the clepsydra, or water clock, which measured time by the regular dripping of water through a narrow opening. As water accumulated in the lower reservoir, a float carrying a pointer rose and marked the hours.The best water clocks were quite elaborate but few in number and fragile. They could not be relied on to tell time more closely than a fairly large fraction of an hour.
