Note 47 — Chapter I · NAVE AND AISLE VAULTS

Enlart, I, p. 267, Fig. 100 and Lasteyrie, p. 413, Fig. 430.

The clerestory at Vaison is hardly worthy of the name, for its windows are cut entirely above the imposts of the vault, which is of pointed section, and therefore does not acquire thickness so rapidly as to render the windows too deep to admit a reasonable amount of light. The construction of such a clerestory consists merely in taking advantage of the pointed form of vaulting without presenting structural advances. Its windows are necessarily small and deep set and the system is not a satisfactory solution of the lighting problem.