Standards
Above the curtain wall's foundations, one or more footing courses were laid. Offsets were introduced above these footing courses (on both the north and south faces), which reduced the wall's width. Where the width of the curtain wall is stated, it is in reference to the width above the offset. Two standards of offset have been identified. Standard A, where the offset occurs above the first footing course, and Standard B where the offset occurs after the third (or sometimes fourth) footing course.
Read more about this topic: Hadrian Wall, Construction
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