National Geographic : 1912 Jan
THE SEA-KINGS OF CRETE MAIN DRAIN: KNOSSOS TERRA-COTTA DRAIN-PIPES, 3,500 YEARS OLD "The hydraulic science of the Minoan architects is wonderful in the completeness with which it provided for even the smallest details. On a staircase, . . lest the steepness of the gradient should allow the water to descend too rapidly and flood the pavement below, the runnel is so constructed that the water follows a series of parabolic curves, and the rapidity of its fall is thus checked by friction" (see pages II and 12).