. Medieval architecture, its origins and development, with lists of monuments and bibliographies. be strengthened by interlocking the voussoirs of thetwo arches — that is, placing the vertical joints in such a waytiiat they would not come directly over each other, thus avoid-ing the formation of a continuous crack between the process continued, the arch being made constantly thicker,will give the barrel vault (111. 7 and 111. 7«). The barrel vault may be constructed with a complete cen-tering, in precisely the same manner as the arch. Such a pro-cess is expensive for a large vault,
. Medieval architecture, its origins and development, with lists of monuments and bibliographies. be strengthened by interlocking the voussoirs of thetwo arches — that is, placing the vertical joints in such a waytiiat they would not come directly over each other, thus avoid-ing the formation of a continuous crack between the process continued, the arch being made constantly thicker,will give the barrel vault (111. 7 and 111. 7«). The barrel vault may be constructed with a complete cen-tering, in precisely the same manner as the arch. Such a pro-cess is expensive for a large vault, say one hundred feet long, asit would require a centering also one hundred feet long. The 15 THE HERITAGE OF ANTIQUITY thrifty Romans accordingly devised the scheme shown in 111. 8and 111. 7, Fig. 5. Along the space to be vaulted, at convenientintervals, arches — called ribs — were erected. These archeswere all of the same size, and the same centering could be usedfor all, being moved to the next after each in turn had beencompleted. Then using the arches already erected as Perspective of the Barrel ^ault intermediate arches were sprung, covering the space betweenthe original arches, on whose edges they rested. If the introduction of the principle of the arch was an ad-vance of grave significance, the vault which followed as a neces-sary corollary was destined to bear in the future even a richerharvest. It now became possible to treat the interior with fargreater dignity than had ever before been accorded it. Largerspaces were spanned and this without the aid of intermediatesupports. This increase in the size of rooms was well suited 16
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Keywords: ., bookcentury1900, bookdecad, booksubjectarchitecture, bookyear1912
