The drawing below is from Gustave Eiffel's book describing the tower that bears his name. There are 53 of them in total.
XXI. General plan of the lifts
This plan, the 21st, is the continuation of the previous one. it also shows the location of the elevators, but in plan view. It also contains a big legend, which explains point by point the different elements of these lifts from where we can understand their mode of operation. These are water elevators, which require pumps, tanks and pipelines.
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