found the structure for his conservatory which he tested by floating his daughter Annie on a leaf. The secret was in the rigidity provided by the radiating ribs connecting with flexible cross-ribs. Constant experimentation over a number of years led him to devise the glasshouse design that inspired the Crystal Palace.

With a cheap and light wooden frame, the conservatory design had a ridge-and-furrow roof to let in more light and drained rainwater away. He used hollow pillars doubling as drain pipes and designed a special rafter that