The drawing below is from Gustave Eiffel's book describing the tower that bears his name. There are 53 of them in total.
XII. Panels 9 to 13 of the second floor
This plate shows the assembly diagrams of the panels 9 to 13, ie those rising on the 2nd floor. These are very technical descriptions, there is no place for artistic performances, for example. We must how are listed the beams forming a box, because this part is a succession of caisson smaller and smaller.
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