What technology did they use to assist the Eiffel Tower construction?

Steam engines and hydraulic systems: Steam engines powered the cranes and other machinery used to lift and move heavy materials. Hydraulic systems were also used to power the hydraulic presses that shaped the metal components.

Electric lighting: Electric lighting was used to illuminate the construction site at night, allowing work to continue around the clock.

Elevators: Elevators were used to transport workers and materials up and down the tower.

Telephones: Telephones were used to communicate between different parts of the construction site.

Photography: Photography was used to document the progress of the construction.