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  • image Image 1 for SM (19) 77/1/21 (20) 77/1/22
  • image Image 2 for SM (19) 77/1/21 (20) 77/1/22
  • image Image 3 for SM (19) 77/1/21 (20) 77/1/22
  • image Image 4 for SM (19) 77/1/21 (20) 77/1/22
  • image Image 1 for SM (19) 77/1/21 (20) 77/1/22
  • image Image 2 for SM (19) 77/1/21 (20) 77/1/22
  • image Image 3 for SM (19) 77/1/21 (20) 77/1/22
  • image Image 4 for SM (19) 77/1/21 (20) 77/1/22

Reference number

SM (19) 77/1/21 (20) 77/1/22


Working drawings of roof timbers, 18 October 1792 (2)


19 Section of Roof over new Building; detail of the ridge of the roof; and detail of the Foot of the Principal Rafter 20 Plan, shewing the Beams of the Roof / over new Building; two longitudinal sections; two cross-sections; two elevations of beams; and rough section of the roof


(19) bar scale of 2/7 inch to 1 foot and to a scale of 3 In: to a Foot (20) bar scales of 2/7 inch to 1 foot and 2/3 inch to a foot


19 as above, The Marquiss of Buckingham, Front to Street, Back front, section lettered A to E corresponding to Reference: A. Principal Rafters ... 8 [inches] by 8 at foot 8 by 6 at top // B. King Posts .... 12 by 8 // C. Braces .... 8 by 4 // D. Beams .... 12 by 8 // E. Principals .... 8 by 6 at foot 8 by 4 at top, dimensions given, Part of the Roof, Common Rafter / (old stuff), Ridge / Board / 2 In, 12 Inches, Common Rafter / (old stuff), 6" In, Foot of the Principal Rafter, 8 In, Wall Plate, 12 In: 20 as above, The Marquiss of Buckingham, Wall plate (three times), Line of Ridge 38'6", 23 feet (twice), 16'6 in, plan lettered A and B, sections lettered A (twice), a (three times), a.a.a. Tenants, 9 In, 6 In, 6 In, 7 In, 6 in (twice), 9 in, Tenant (three times), 3 in, Beams of Roof, Truss at A and severed at B, Bottom / plates of / trusses A & B, 42 feet, and dimensions given

Signed and dated

  • (19) Copy Octr 18th 1792 (20) Copy Octr 18th 1792

Medium and dimensions

(19-20) Pencil, pen and yellow, grey and black washes, on laid paper with one fold mark (642 x 511, 631 x 505)


(19-20) Thomas Chawner (1774-1851, pupil December 1788-1794)


The working drawings are for the roof covering the rebuilt west building. The roof has two ridges, both supported by king posts, and a flat section in the centre that is also supported by a king post. The section in drawing 19 shows arched braces supporting the extended rafters at both ends. The sections also show the iron straps used to secure the beams. The 'Tenants' on drawing 19 are tenons; as described in the The Dictionary of architecture, these are pieces of timber inserted 'into the side of a beam or girder, and through it, to prevent its drawing out.' Tenons fell out of use in the nineteenth century because, as the Dictionary states, it was found that the piece 'greatly weakens the main girder: accidents have happened'.


W. Papworth (ed) for the Architectural Publication Society, Dictionary of architecture, published in parts 1848-1892, volume VIII, p. 22.



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