The purpose of the contract is the construction of two staircases in the south tower, including ancillary works: a double spiral staircase in the four-loil room with the bourdons; and a staircase with a single revolution from the gallery of chimeras to the level of the bumblebees

The purpose of the contract is the construction of two staircases in the south tower, including ancillary works: a double spiral staircase in the four-loil room with the bourdons; and a staircase with a single revolution from the gallery of chimeras to the level of the bumblebees