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
Faras Gallery at the National Museum in Warsaw the 7th until the 14th century. The Cathedral was built on the foundations of an older church, built in the beginning of the 7th century AD. In rooms II and III the visitors can view films on the history of discoveries, Nubia and the Nubian Campaign, as well as individual paintings, their style and iconography. Also shown are the photographs of the archaeological campaigns and the photographs of artworks which were transferred to the National Museum of Sudan. Another presentation concerns professor Kazimierz Michałowski, the archaeologist who discovered the Faras Cathedral, and the patron of the gallery. This room contains