Carpenters: 4

Tie beams: west aisle of the south transept

Here, we see the experimentation in setting of the wooden ties directly over the capital.

Wooden Tie Beams (Viollet-le-Duc)

In this image of the wooden tie beams, we can see the tie beam still in place (right) and cut out (left). 

Wooden Tie Beams (Viollet-le-Duc)
Wooden Tie Beam above Capital
Wooden Tie Beam above Capital