Whispering-gallery wave known as surface plasmons has been demonstrated in the form of whispering-gallery waves, and likewise for exciton-polaritons in semiconductors. Galleries simultaneously containing both acoustic and optical whispering-gallery waves have also been made, exhibiting very strong mode coupling and coherent effects. Hybrid solid-fluid-optical whispering-gallery structures have been observed as well. Whispering-gallery wave Whispering-gallery waves, or whispering-gallery modes, are a type of wave that can travel around a concave surface. Originally discovered for sound waves in the whispering gallery of St Paul’s Cathedral, they can exist for light and for other waves, with important applications in nondestructive testing, lasing, cooling and sensing,
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