2-888-000 - The Print Collector/Heritage Images

The Great Exhibition Building in Hyde Park - Moving a Pair of Transept Ribs, Framed Together, Previous to Hoisting, 1850. 'When the frame of double ribs is moved to its horizontal position above the sockets, each side of the frame is attached to pulley-tackle on the top of a derrick raised on either gangway...by means of ropes attached to the crabs. Thus, the whole frame is once more suspended; and the rollers and temporary timbers having been removed, the legs are dropped into their respective sockets. The space on either side, 24 feet wide, is covered with lead, forming what is termed a "lead flat", which will receive the water from the roof of the transept. On the side of the "flat", removed from the transept, is a wide gutter lined with lead, and laid with proper fall to the rain-water heads over the hollow columns'. From "Illustrated London News", 1850.