PARIS — A crane hoisted massive oak trusses from a barge and onto Notre Dame Cathedral on Tuesday in a spectacular operation to rebuild the fire-ravaged monument and bring it back to life by December 2024. …“I think it’s a magical moment,” said Minister Clement Beaune, noting that the Seine will be at the center of the Paris Olympics in 2024. Gen. Jean-Louis Georgelin said that even the heavy traffic expected during the summer Games won’t stop work on the world-renowned cathedral. “We will work for the cathedral during the Olympics in order to be ready in December 2024,” he said. …Notre Dame, which overlooks the historic core of Paris from an island on the Seine, was consumed by flames in 2019. It was decided to rebuild the monument using methods of yore. Expert carpenters used medieval techniques to construct the trusses, which measure 14 to 16 meters wide and 12 to 13 meters high.