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
Gallery 30 Gallery 30's book department in an advisory capacity, Gisick took Gallery 30's selection in a different direction with the launch of a literary project that he dubbed “Man to Man Books.” By 1992 Gisick had compiled “the largest catalogue of men’s studies books available” in the United States, prompting one publisher to call Gallery 30 “the men’s bookstore for the nation.” During his time as owner, Gisick also made changes to Gallery 30's art department, adding handcrafted gold and sterling silver jewelry and more contemporary artisan crafts. In May 1993, Gallery 30 and its historic building were purchased by Washington,