62 3.1 - from the Old / Wall - to front of Col[umn]
63-64 some dimensions given
Drawing 62 is for an unidentified detail.
Drawings 63 and 64 show a square aperture set into the apex of the arch of the side-bay barrel vault (which can also be seen on the far right of drawing 70). This must have been an entry hatch for the workmen to access the roof. The topmost central point of the barrel-vault was the only position that an opening could be made (practically and structurally), as it acted in the position of a key stone. Once the other side vaults were completed, this would have been the only point at which it would be practical to erect scaffolding for the workmen to climb up (the central oculus was higher). Building materials must have been winched up through the central opening however. The later preliminary presentation drawings (drawings 84 and 85) do not show this opening, suggesting it was then filled in and plastered over, when work on the roof was complete.
As they are undated, drawings 62 to 64 could be of either the later south or south-east Transfer Office.
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