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" ... By the second half of the Middle Ages (1000-1500 AD) the wind and water-powered agarian revolution of the previous few centuries made Christian Europe into a rich, populous and expanding power. Medieval people began to experiment with other uses of mechanisation. Noting that warm air moved up a chimney (which were another Medieval innovation), larger Medieval kitchens had fans installed in the chimney to automatically turn spits by use of a gearing system. Medieval monks noted that using a similar gearing system driven by a descending weight might be used to measure out an hour of time mechanically. In the Thirteenth Century the first mechanical clocks began to appear across Europe, a Medieval innovation that would revolutionise how humans saw time. Medieval clocks developed rapidly, with miniaturised table clocks appearing within a few decades of the instrument's invention. Medieval clocks could be vastly complex calculating devices. The immensely complicated astronomical clock built by Richard of Wallingford, abbot of St Albans, was so complex it took eight years to run through its full cycle of calculations and was the most intricate machine ever built up to that point. ... "