The original 177-ft.-long, barrel-vault system was restored while a new 187-ft.-long, high-performance system was installed above it. The original skylight’s cast-iron frame consisted of 13 individual, 12-ft. wide × 83-ft. long, segmented “ribbons” with a total of 2,068 lites of 0.25-in. wire glass. In restoring the historic skylight, the system was de-glazed, repaired and re-painted, and its existing glass lites were replaced with 9⁄16-in.-thick translucent, laminated, heat-strengthened glass.
