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
Gallery 30 collection of local and regional fine art by placing a greater emphasis on Pennsylvania and Gettysburg-related subject matter. In 2013, Atiyeh expanded Gallery 30 by moving the business to a larger historic building at 26-28 York Street, next door to Gallery 30's original location. In April 2015, The historic 19th Century building that originally housed Gallery 30 is located at 30 York Street, also known as US Route 30 and the historic Lincoln Highway, in Gettysburg, Pennsylvania. The brick building bears an official plaque that verifies it as a Civil War building that was standing during the Battle of Gettysburg