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In medieval times, the regulation of monastic calls to prayer was accomplished by means of mechanical tower clocks. This revolutionary device soon synchronized the rhythms of entire cities. World views of entire cultures were influenced by the type of clocks they used. The development of atomic clocks, accurate to a billionth of a second, seem to reflect modern society's near-obsession with youth, age and the passage of time. The very first early mechanical clocks, which didn’t have pendulums, were developed in the last half of the thirteenth century, probably by monks from central Europe, and were placed within the church. They did not have dials or hands and only struck bells on the hour. These mechanical devices were probably placed in the church belfry in order to make use of the existing church bell. It was over 100 years before visible dials and hands were added. These early clocks were very large and were made of heavy iron frames and gears forged by the local blacksmiths.
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