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
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,