CONSTRUCTION OF THE BUILDING. 59

Fig. 7.

of these trusses is shown in fig. 8. In order to give additional support to them,four extra columns have been attached to those situated at the intersection of thenave and transept.

Fig. 8.

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The direction of the 72-feet trusses of the roof of the nave being of course ™ nniSud s ’

transverse to its length, and the trusses occurring at intervals of 24 feet, it became longitudinally,necessary, in order to perfectly steady them, that timbers (shown in section andelevation at B B, fig. 7) should be thrown across from one to the other, m