Whispering gallery to the walls, an effect that was discovered in the whispering gallery of St Paul's Cathedral in London. The extent to which the sound travels at St Paul's can also be judged by clapping in the gallery, which produces four echoes. Other historical examples are the Gol Gumbaz mausoleum in Bijapur and the Echo Wall of the Temple of Heaven in Beijing. A hemispherical enclosure will also guide whispering gallery waves. The waves carry the words so that others will be able to hear them from the opposite side of the gallery. The gallery may also be in the form
South London Gallery grounds of Portland House, whose freehold Rossiter had purchased. In 1893, the Prince of Wales officially opened a lecture hall and library funded by newspaper owner John Passmore Edwards. In 1896, the Gallery was relocated at the Vestry of Camberwell. In 1898, Royal Academy President, Sir Edward Poynter opened a Technical Institute, which again had been funded by Passmore Edwards (to commemorate Lord Leighton who had died) on the site of Portland House. It later became Camberwell College of Art, which was run by the London County Council from 1904, though the Gallery was still under the local authority. The