1845 R. Willis 95 The foliated capitals, the square abacus, and that set diagonally when appertaining to the diagonal rib-shafts.
1914 A. M. Brooks ix. 203 There is no capital where the transverse rib shaft passes the capital of the main pier and those of the arcades.
1993 32 50 Rib shafts will almost never have the same diameter as..transverse arch shafts.