Crystal Palace, London, United Kingdom, Joseph Paxton, 1851, cross section, from Peter Berlyn and Charles Fowler, The Crystal Palace: Its Architectural History (London, 1851), pl op p 54		Crystal Palace, London, United Kingdom, Joseph Paxton, 1851, perspective of roof, from Peter Berlyn and Charles Fowler, The Crystal Palace: Its Architectural History (London, 1851), pl op p 39