turbine was installed in 1988 that produces about a third of the electricity the house needs. The Conservative Wall is a set of greenhouses that run up the slope from Flora's Temple to the stables against the north wall of the garden. A tall central section is flanked by ten smaller sections used to grow fruit and camellias. Two Camellia reticulata 'Captain Rawes' planted in 1850 survive. Chatsworth's camellias have won many prizes. The name of the building has no political connotations; the Dukes of Devonshire were Whigs and later Liberals. The bust of the 6th Duke on a Poseidon Temple column was erected in the 1840s and situated at the south end of today's Serpentine Hedge. The four classical column drums beneath were a gift from the 6th Duke's half brother, Augustus Clifford, who collected these drums from the site of the Temple of Poseidon, Cape Sounion between 1821 and 1825, during his naval service as the captain of . The column is possibly composed by the bottom, 3rd, 4th, and the 6th drum from a single collapsed temple column, while the British Museum preserves the 7th. The inscription on the pedestal erroneously credits the origin of these drums to the Temple of Athena, Cape Sounion, a smaller site located north-west of the Temple of Poseidon. Two significant features from the period have been lost: The Great Conservatory, also known as the "Great Stove", was the largest glasshouse in the world at that time. Paxton and architect Decimus Burton designed this glasshouse, which was begun in 1836 and completed in 1841 at a cost of £33,099. It was long, wide and high. It used eight coal-fired furnaces to send hot water through of pipes. A carriage drive ran the length of the building between lush tropical vegetation. One W. Adam called it "A mountain of glass... an unexampled structure... like a sea of glass when the waves are settling and smoothing down after a storm." The King of Saxony compared it to "a tropical scene with a glass sky". The Great Conservatory was demolished in 1920, as it had not been heated during World War I to conserve coal. The Victoria regia House or Lily House, built by Paxton in 1849–1850, was devoted to the giant Amazon water lily Victoria amazonica, which flowered in captivity there for the first time. Like the Great Conservatory, the Lily House was unused