Drawing of a ceiling boss - SMC206

This is a ceiling boss in the first bay of the choir, from the crossing, of St Magnus Cathedral. It was drawn by Sir Henry Dryden between 1845 and 1855 when he spent summers sketching aspects.

A boss is a knob or projection and is a purely ornamental feature. Its purpose is to cover the intersecting points of the ribs in a vault. Bosses, as can be seen in St Magnus Cathedral, are often carved with foliage designs.

Bosses can be seen in the high vaulting of the choir and nave. They can also be seen in the aisles but not all the vaults have them.

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