Half internal plan, north side, for setting out the engraved long section in WRE/5/1/2, reused later for alternative eighth-plans of the dome. Reverse: pencil study for a pedestal

Perspective of a dome with a 24-bay upper peristyle and an octagonal, concave-sided lower peristyle and drum

Two incomplete half-sections on the cardinal axis (left) and the diagonal axis (right) for a dome with an octagonal, concave-sided peristyle, developed from WRE/5/1/9 and 10. Reverse: study for a lantern, unrelated to St Paul’s

Half-section and quarter-plan (left), with half-elevation (right), of a 24-bay dome, arranged with apses on the diagonal axes (left) and on the cardinal axes (right)

Two designs for relief decoration: (upper) on the vault pendentives above the clerestory windows; (lower) on the heads of the crossing arches