References in classic literature ?
For had it been the rule for a hundred tragedies to compete together, the performance would have been regulated by the water-clock,--as indeed we are told was formerly done.
As underneath the mulberry-tree I dream, The water-clock drips on, and dawn appears: A new day shines on wrinkles and white hair, The symbols of the fulness of my years.
The Tower of the Winds, a monument of GreeceAEs classical period, was originally built to chart the direction of the wind and to keep time with the water-clock inside.