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
Catalogue of paintings in the National Gallery, London Catalogue of paintings in the National Gallery, London The Catalogue of paintings in the National Gallery, London lists the named painters of the collection of the National Gallery, London, as they were catalogued in 2010 by the Public Catalogue Foundation. The collection contains roughly 2,300 paintings by 750 artists, and only attributed artists are listed here. Painters with more than twenty works in the collection are Jean-Baptiste-Camille Corot, Carlo Crivelli, Anthony van Dyck, Francesco Guardi, Rembrandt van Rijn, Peter Paul Rubens, Jacob van Ruisdael, and David Teniers II. The only women artists with works in the collection are Marie Blancour,