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In page Eiffel Tower:

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For the 1900 Exposition Universelle, the lifts in the east and west legs were replaced by lifts running as far as the second level constructed by the French firm Fives-Lille. These had a compensating mechanism to keep the floor level as the angle of ascent changed at the first level, and were driven by a similar hydraulic mechanism as the Otis lifts, although this was situated at the base of the tower. Hydraulic pressure was provided by pressurised accumulators located near this mechanism.[2] At the same time the lift in the north pillar was removed and replaced by a staircase to the first level. The layout of both first and second levels was modified. The original lift in the south pillar was removed 13 years later.[citation needed]