The drawing below is from Gustave Eiffel's book describing the tower that bears his name. There are 53 of them in total.
XVI. Sets of floors of various floors
This board details the different floors that the tower counts. There is the floor of stack 3, at ground level, that of the 2nd floor, that of machinery, that of the 3rd floor, etc., plus various structural elements associated with these floors. There is also a large amount of beams, joists and joists to support these floors. This technical board is quite interesting.