Interval between 4th and 5th Porches

Sheet No. 166 St. Marks. The interval between the 4th and 5th Porch and basement side of the 5th Porch. Refers to St M[arks] Book p.49L ‘We now come to interval between the two intermediate northern vaults. This on the basement is given on No 166. fig 1. with details above its upper shafts’ St M[arks] Book p.49L (RL 1636 box). Not referred to in M or M2.

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[Version 0.05: May 2008]