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The crypt was originally used as a chantry chapel, subsequently
as a charnel house (or 'bone hole'), then as an engine house for
the blowing of the organ, and now as a quiet room for prayer and
reading.
The stone vault shows traces of over 200 masons' marks representing
the work of 12 masons. Mason's marks are small graffiti (in the
case of St Mary's usually not more than about an inch in height)
serving as signatures for the masons, most of whom would be illiterate.
As sons followed fathers in their craft it was traditional for
them to adopt their father's mark, maybe with some small personal
variations.
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