Whispering-gallery wave 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, as well as in astronomy. Whispering-gallery waves were first explained for the case of St Paul's Cathedral circa 1878 by Lord Rayleigh, who revised a previous misconception that whispers could be heard across the dome but not at any intermediate position. He explained the phenomenon of travelling whispers with
Guildhall Art Gallery Guildhall Art Gallery The Guildhall Art Gallery houses the art collection of the City of London, England. It occupies a building that was completed in 1999 to replace an earlier building destroyed in The Blitz in 1941. It is a stone building in a semi-gothic style intended to be sympathetic to the historic Guildhall, which is adjacent and to which it is connected internally. The gallery was originally built in 1885 to house art collections from the City of London Corporation and the present collection consists of about 4,000 works, of which around 250 are on display at any one