The next major period of restoration began in the 1840s and much of the oversight was the responsibility of Dean George Peacock (1839–58). In conjunction with the Cambridge Professor Robert Willis, he undertook thorough investigations into the structure, archaeology and artistic elements of the building, and made a start on what became an extensive series of refurbishments by restoring the south-west transept. This had been used as a 'workshop', and by stripping out more recent material and restoring the Norman windows and arcading, they set a pattern that would be adopted in much of the Victorian period works. In 1845, by which time the cathedral had works underway in many areas, a visiting architect, George Basevi, who was inspecting the west tower, tripped, and fell 36 feet to his death. He was given a burial in the north choir aisle. Works at this time included cleaning back thick layers of limewash, polishing pillars of Purbeck marble, painting and gilding roof bosses and corbels in the choir, and a major opening up of the West tower. A plaster vault was removed that had been put in only 40 years before, and the clock and bells were moved higher. The addition of iron ties and supports allowed removal of vast amounts of infill that was supposed to strengthen the tower, but had simply added more weight and compounded the problems.