In the 10th century, monks throughout Europe, who were particularly concerned with time to regulate their daily schedules and prayers, were experimenting with mechanical clocks more regularly. This included creating mechanical wheels and gears that would tick using the principals developed in escapements. The oldest functioning clock might be the clock in Salsbury Cathedral, which dates to the late 14th century. This uses a series of mechanical wheels that used a series of wheels and was set to strike at given intervals, probably every hour. Increasingly, such devices that used gears and wheels to tick at set intervals were used. Throughout the 14th century, and probably as early as the 11th century, mechanical clocks were becoming more regular features in cities, churches, and cathedrals in particular.