Geometry of the Barn (3)

Constructive Geometry of the Ground Plan of the North Barn at Thorley Hall (St Barnabas Centre)

These notes are on three pages - page 1, page 2 and this page.

Final layout diagram The sizes of the nave and aisle widths are 'irrational' relationships with the basic 1 rod scale. However if set out geometrically there is no problem as no measurements are needed, only intersection points of lines and circles easily done by cords at full size and very accurate. The sizes produced are very close to nave 19' wide and aisles 7' wide. This looks deceptively easy but how else do you achieve a logical proportion of 7 : 19 : 7 by arithmetical means.

Barn proportions were not random. A logical unifying and easily performed method was commonly used using circle derived geometry.

References:
'The constructive geometry in the thirteenth century barns at Cressing Temple' - Essex Archaeology and History 25 (1994), 107 - 112
'Further Light on the design of the Great Barns at Cressing Temple' - Essex Archaeology and History 27 (1996), 182 - 187

Adrian V.B. Gibson - May 2004

These notes are on three pages - page 1, page 2 and this page.