A Mass Dial can be seen by the rood stairs on the south wall.
Mass dials (scratch dials) are medieval and found on the south walls of churches, however due to rebuilding they can often be found repositioned on internal church walls, as in this case.
They are not meant for recording the hours of the day, but as a marker for church services.
A wooden or metal peg called the gnomon, was put in the hole and it's shadow marked the times for morning mass, noon and vespers (evensong) to make sure that both the priest and people were in time for services in the days before clocks and watches.
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