A whispering gallery is usually a circular, hemispherical, elliptical or ellipsoidal enclosure, often beneath a dome or a vault, in which whispers can be heard clearly in other parts of the gallery. Such galleries can also be set up using two parabolic dishes. Sometimes the phenomenon is detected in caves.
A whispering gallery is most simply constructed in the form of a circular wall, and allows whispered communication from any part of the internal side of the circumference to any other part. The sound is carried by waves, known as whispering-gallery waves, that travel around the circumference clinging to the walls, an effect that was discovered in the whispering gallery of St Paul's Cathedral in London. [1] The extent to which the sound travels at St Paul's can also be judged by clapping in the gallery, which produces four echoes. [2] Other historical examples [3] [4] [5] are the Gol Gumbaz mausoleum in Bijapur, India 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 of an ellipse or ellipsoid, [4] with an accessible point at each focus. In this case, when a visitor stands at one focus and whispers, the line of sound emanating from this focus reflects directly to the focus at the other end of the gallery, where the whispers may be heard. In a similar way, two large concave parabolic dishes, serving as acoustic mirrors, may be erected facing each other in a room or outdoors to serve as a whispering gallery, a common feature of science museums. Egg-shaped galleries, such as the Golghar Granary at Bankipore, [3] and irregularly shaped smooth-walled galleries in the form of caves, such as the Ear of Dionysius in Syracuse, [4] also exist.
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The term whispering gallery has been borrowed in the physical sciences to describe other forms of whispering-gallery waves such as light or matter waves. [16]
Gloucester is a cathedral city and the county town of Gloucestershire in the South West of England. Gloucester lies on the River Severn, between the Cotswolds to the east and the Forest of Dean to the west; it is sited 19 miles (31 km) east of Monmouth and 17 miles (27 km) east of the border with Wales. Gloucester has a population of around 132,000, including suburban areas. It is a port, linked via the Gloucester and Sharpness Canal to the Severn Estuary.
A rotunda is any roofed building with a circular ground plan, and sometimes covered by a dome. It may also refer to a round room within a building. The Pantheon in Rome is perhaps the most famous, and is the most influential rotunda. A band rotunda is a circular bandstand, usually with a dome.
Gol Gumbaz, also written Gol Gumbad, is a 17th-century mausoleum located in Bijapur, a city in Karnataka, India. It houses the remains of Mohammad Adil Shah, seventh sultan of the Adil Shahi dynasty, and some of his relatives. Begun in the mid-17th century, the structure never reached completion. The mausoleum is notable for its scale and exceptionally large dome. The structure is an important example of Adil Shahi architecture.
An acoustic mirror is a passive device used to reflect and focus (concentrate) sound waves. Parabolic acoustic mirrors are widely used in parabolic microphones to pick up sound from great distances, employed in surveillance and reporting of outdoor sporting events. Pairs of large parabolic acoustic mirrors which function as "whisper galleries" are displayed in science museums to demonstrate sound focusing.
3D audio effects are a group of sound effects that manipulate the sound produced by stereo speakers, surround-sound speakers, speaker-arrays, or headphones. This frequently involves the virtual placement of sound sources anywhere in three-dimensional space, including behind, above or below the listener.
The Tennessee State Capitol, located in Nashville, Tennessee, is the seat of government for the U.S. state of Tennessee. It serves as the home of both houses of the Tennessee General Assembly–the Tennessee House of Representatives and the Tennessee Senate–and also contains the governor's office. Designed by architect William Strickland (1788–1854) of Philadelphia and Nashville, it was built between 1845 and 1859 and is one of Nashville's most prominent examples of Greek Revival architecture. The building, one of 12 state capitols that does not have a dome, was added to the National Register of Historic Places in 1970 and named a National Historic Landmark in 1971. The tomb of James K. Polk, the 11th president of the United States, is on the capitol grounds.
The Jubilee Walkway is an official walking route in London. It was originally opened as the Silver Jubilee Walkway to commemorate Queen Elizabeth II's accession; the Queen herself opened it on 9 June 1977 during her silver jubilee celebrations. The intention was to connect many of London's major tourist attractions and it is now one of seven such walks within the Mayor of London's strategic walking routes. Its length is 15 miles.
A four-centred arch or four-centered arch is a low, wide type of arch with a pointed apex. Its structure is achieved by drafting two arcs which rise steeply from each springing point on a small radius, and then turning into two arches with a wide radius and much lower springing point. It is a pointed sub-type of the general flattened depressed arch. This type of arch uses space efficiently and decoratively when used for doorways. It is also employed as a wall decoration in which arcade and window openings form part of the whole decorative surface. Two of the most notable types are known as the Persian arch, which is moderately "depressed" and found in Islamic architecture, and the Tudor arch, which is much flatter and found in English architecture. Another variant, the keel arch, has partially straight rather than curved sides and developed in Fatimid architecture.
English Gothic is an architectural style that flourished from the late 12th until the mid-17th century. The style was most prominently used in the construction of cathedrals and churches. Gothic architecture's defining features are pointed arches, rib vaults, buttresses, and extensive use of stained glass. Combined, these features allowed the creation of buildings of unprecedented height and grandeur, filled with light from large stained glass windows. Important examples include Westminster Abbey, Canterbury Cathedral and Salisbury Cathedral. The Gothic style endured in England much longer than in Continental Europe.
A parabolic arch is an arch in the shape of a parabola. In structures, their curve represents an efficient method of load, and so can be found in bridges and in architecture in a variety of forms.
The Bijapur Fort is located in the Bijapur city in Bijapur District of the Indian state of Karnataka. Bijapur fort has a plethora of historical monuments of architectural importance built during the rule of Adil Shahi dynasty.
The antiquity of architecture of Karnataka can be traced to its southern Neolithic and early Iron Age, Having witnessed the architectural ideological and utilitarian transformation from shelter- ritual- religion. Here the nomenclature 'Architecture' is as old as c.2000 B.C.E. The upper or late Neolithic people in order to make their shelters by their own they constructed huts made of wattle and doab, that were buttressed by stone boulders, presumably having conical roof resting on the bamboo or wooden posts into red murram or paved granite chips as revealed in archaeological excavations in sites like Brhamagiri, Sanganakallu, Tekkalakota, Piklihal. Megaliths are the dominant archaeological evidence of the early Iron Age. There are more than 2000 early Iron Age burial sites on record, who laid the foundation for a high non-perishable architecture in the form of various distinct architectural styles of stone-built burials, which are ritualistic in its character. The active religious architecture is evident 345 with that of the Kadamba Dynasty. Karnataka is a state in the southern part of India originally known as the State of Mysore. Over the centuries, architectural monuments within the region displayed a diversity of influences, often relaying much about the artistic trends of the rulers of twelve different dynasties. Its architecture ranges dramatically from majestic monolith, such as the Gomateshwara, to Hindu and Jain places of worship, ruins of ancient cities, mausoleums and palaces of different architectural hue. Mysore Kingdom (Wodeyar) rule has also given an architectural master structure in the St. Philomena's Church at Mysore which was completed in 1956, in addition to many Dravidian style architectural temples. Two of the monuments are listed under the UNESCO World Heritage List of 22 cultural monuments in India. Styles of Indo-Saracenic, Renaissance, Corinthian, Hindu, Indo-Greek and Indo-British style palaces were built in Mysore, the city of palaces. Sikh architecture at Bidar (1512) and also in Bangalore in 1956 can also be cited as having an impact on the architectural composition of the state.
Thomas P. Barnett, also known professionally as Tom Barnett and Tom P. Barnett, was an American architect and painter from St. Louis, Missouri. Barnett was nationally recognized for both his work in architecture and in painting.
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.
Perpendicular Gothic architecture was the third and final style of English Gothic architecture developed in the Kingdom of England during the Late Middle Ages, typified by large windows, four-centred arches, straight vertical and horizontal lines in the tracery, and regular arch-topped rectangular panelling. Perpendicular was the prevailing style of Late Gothic architecture in England from the 14th century to the 17th century. Perpendicular was unique to the country: no equivalent arose in Continental Europe or elsewhere in the British Isles. Of all the Gothic architectural styles, Perpendicular was the first to experience a second wave of popularity from the 18th century on in Gothic Revival architecture.
An elliptical dome, or an oval dome, is a dome whose bottom cross-section takes the form of an ellipse. Technically, an ellipsoidal dome has a circular cross-section, so is not quite the same.
