The drawing below is from Gustave Eiffel's book describing the tower that bears his name. There are 53 of them in total.
XI. Decorative bows, beams of arches and beams of the first floor
This board is the continuation of the X board, it describes the following technical details of assembly of the different elements of the Eiffel Tower. There is also the detail of the decorations of the first floor, it allows to have a view on what had been installed initially. It should be known that these sets have been partially redone since.
See also: