The drawing below is from Gustave Eiffel's book describing the tower that bears his name. There are 53 of them in total.
XXIII. Articulated piston lifts, Roux Combaluzier and Lepape system. Lower part. Mechanism
This technical sheet explains the different components and the way in which the Roux lift, Combaluzier and Lepape are installed. if this plan is complex enough, it is not necessary to understand it to know how was made the Eiffel Tower.