St. Paul’s Cathedral Dome

Animated Construction Sequence

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St. Paul’s Cathedral features an innovative triple dome structure. On the circular drum, the inner dome rises and is visible from the cathedral interior. Above this inner dome, a brick cone rises to support the 850 ton lantern. This brick cone also supports the wood rafters and frame of the outer dome, which is covered in wood and lead.

This three dome system allows the cathedral to support such a heavy lantern, all the while maintaining the great height needed to be a visible London landmark.

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Created in Sketchup and animated in Final Cut Pro
Developed with input from James Campbell at the Cambridge University: Department of Architecture
With music from the organ (William Tell’s Overture) and bells of St Paul’s Cathedral (recorded 2013)

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Virtual Reality Model

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This scale model is created from measured plans of the structure, and is accurate to the foot. The dome of St. Paul’s consists of four interlinked structures:

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  • The Inner Dome – visible from the cathedral interior and purely for show; height = 225 ft (69 m)
  • The Middle Dome – a brick cone that is invisible from below but supports the 850 ton lantern above; height = 278 ft (85 m)
  • The Outer Dome – a wood and lead-roofed structure visible from the cathedral exterior; height = 278 ft (85 m)
  • The Lantern – an 850 ton stone lantern and cross, whose weight rests on the Middle Dome = 365ft (111 m)

The Inner and Outer Domes are decorative, while the Middle Dome is the true weight-bearing support system.

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