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
The Mystery of the Whispering Mummy The Mystery of the Whispering Mummy The Mystery of the Whispering Mummy is the third book in The Three Investigators series by Robert Arthur, Jr.. It was originally published in the United States by Random House in 1965. Library of Congress catalog number 99192344 . The boys receive a letter from Alfred Hitchcock requesting they visit a friend of his, Professor Yarborough, who has a mummy along with other artifacts in his house. The mummy has been whispering in a strange language, but only when Yarborough is alone in the room. They also receive a letter from a Mrs Banfry