The Whispering Gallery of St Paul's Cathedral, London A whispering gallery is usually a circular, hemispherical, elliptical or

ellipsoid An ellipsoid is a surface that may be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation. An ellipsoid is a quadric surface; that is, a surface that may be defined as th ...

al enclosure, often beneath a

dome A dome () is an architectural element similar to the hollow upper half of a sphere. There is significant overlap with the term cupola, which may also refer to a dome or a structure on top of a dome. The precise definition of a dome has been a m ...

or a

vault Vault may refer to: * Jumping, the act of propelling oneself upwards Architecture * Vault (architecture), an arched form above an enclosed space * Bank vault, a reinforced room or compartment where valuables are stored * Burial vault (enclosure ...

, 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.

Theory

A whispering gallery is most simply constructed in the form of a circular wall, and allows

whispered is a series of light novels written by Shoji Gatoh and illustrated by Shiki Douji. The series follows Sousuke Sagara, a member of the covert anti-terrorist private military organization known as Mithril, tasked with protectin ...

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 St Paul's Cathedral is an Anglicanism, Anglican cathedral in London and is the seat of the Bishop of London. The cathedral serves as the mother church of the Diocese of London. It is on Ludgate Hill at the highest point of the City of London ...

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

C. V. Raman Sir Chandrasekhara Venkata Raman (; 7 November 188821 November 1970) was an Indian physicist known for his work in the field of light scattering. Using a spectrograph that he developed, he and his student K. S. Krishnan discovered that when ...

On whispering galleries, Proc. Indian Ass. Cult. Sci. 7, 159, 1921-1922.
/ref>W. C. Sabine, Collected Papers on Acoustics (Harvard University Press, Cambridge MA) 1922, p. 255.
/ref>Peiping (American National Red Cross, American Red Cross Embassy Club) 1946, p. 17. are the

Gol Gumbaz 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 ...

mausoleum in Bijapur and the Echo Wall of the

Temple of Heaven The Temple of Heaven () is a complex of imperial religious buildings situated in the southeastern part of central Beijing. The complex was visited by the Emperors of the Ming and Qing dynasties for annual ceremonies of prayer to Heaven for a ...

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 In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant. It generalizes a circle, which is the special type of ellipse in ...

, with an accessible point at each

focus Focus, or its plural form foci may refer to: Arts * Focus or Focus Festival, former name of the Adelaide Fringe arts festival in South Australia Film *''Focus'', a 1962 TV film starring James Whitmore * ''Focus'' (2001 film), a 2001 film based ...

. 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 mirror 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 ...

s, 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 The Golghar or Gol Ghar (गोलघर), ("Round House") is a large granary located to the west of the Gandhi Maidan in Patna, capital of Bihar state, India. History According to a contemporary inscription at its base, the Golghar in Patna ...

Granary at Bankipore, and irregularly shaped smooth-walled galleries in the form of caves, such as the Ear of Dionysius in Syracuse, also exist.

Examples

India

* The

Bijapur Bijapur, officially known as Vijayapura, is the district headquarters of Bijapur district of the Karnataka state of India. It is also the headquarters for Bijapur Taluk. Bijapur city is well known for its historical monuments of architectural i ...

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area, the List of countries and dependencies by population, second-most populous ...

. * The

Granary in

Bankipore Bankipur is a neighbourhood and residential area in Patna, in the Indian state of Bihar. It is located on the bank of the river Ganges. The prime attraction is the Khuda Bakhsh Oriental Library built by Khan Bahadur Khuda Bakhsh in 1891 and G ...

. * The Victoria Memorial in

Kolkata Kolkata (, or , ; also known as Calcutta , the official name until 2001) is the capital of the Indian state of West Bengal, on the eastern bank of the Hooghly River west of the border with Bangladesh. It is the primary business, comme ...

United Kingdom

London London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary dow ...

is the place where whispering-gallery waves were first discovered by

Lord Rayleigh John William Strutt, 3rd Baron Rayleigh, (; 12 November 1842 – 30 June 1919) was an English mathematician and physicist who made extensive contributions to science. He spent all of his academic career at the University of Cambridge. A ...

. * The library of

Dollar Academy Dollar Academy, founded in 1818 by John McNabb, is an independent co-educational day and boarding school in Scotland. The open campus occupies a site in the centre of Dollar, Clackmannanshire, at the foot of the Ochil Hills. Overview As of 20 ...

in Scotland. * The entrance gallery of the Aston Webb Great Hall at the

University of Birmingham , mottoeng = Through efforts to heights , established = 1825 – Birmingham School of Medicine and Surgery1836 – Birmingham Royal School of Medicine and Surgery1843 – Queen's College1875 – Mason Science College1898 – Mason Univers ...

. *

Hamilton Mausoleum Hamilton Mausoleum is a mausoleum located in Hamilton, South Lanarkshire, Scotland. It was the resting place of the family of the Dukes of Hamilton.Hamilton, South Lanarkshire Hamilton ( sco, Hamiltoun; gd, Baile Hamaltan ) is a large town in South Lanarkshire, Scotland. It serves as the main administrative centre of the South Lanarkshire council area. It sits south-east of Glasgow, south-west of Edinburgh and no ...

Scotland Scotland (, ) is a country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a border with England to the southeast and is otherwise surrounded by the Atlantic Ocean to ...

. *

Gloucester Cathedral Gloucester Cathedral, formally the Cathedral Church of St Peter and the Holy and Indivisible Trinity, in Gloucester, England, stands in the north of the city near the River Severn. It originated with the establishment of a minster dedicated to ...

has a whispering gallery.

United States

* The Battle House Hotel in

Mobile, Alabama Mobile ( , ) is a city and the county seat of Mobile County, Alabama, United States. The population within the city limits was 187,041 at the 2020 census, down from 195,111 at the 2010 census. It is the fourth-most-populous city in Alabama ...

has a whispering arch in the front lobby *

Cincinnati Union Terminal Cincinnati Union Terminal is an intercity train station and museum center in the Queensgate neighborhood of Cincinnati, Ohio. Commonly abbreviated as CUT, or by its Amtrak station code, CIN, the terminal is served by Amtrak's ''Cardinal'' line ...

* The Elijah P. Lovejoy Monument in

Alton, IL Alton ( ) is a city on the Mississippi River in Madison County, Illinois, Madison County, Illinois, United States, about north of St. Louis, St. Louis, Missouri. The population was 25,676 at the 2020 United States Census, 2020 census. It is a p ...

, dedicated to the martyred

abolitionist Abolitionism, or the abolitionist movement, is the movement to end slavery. In Western Europe and the Americas, abolitionism was a historic movement that sought to end the Atlantic slave trade and liberate the enslaved people. The British ...

. *

Grand Central Terminal Grand Central Terminal (GCT; also referred to as Grand Central Station or simply as Grand Central) is a commuter rail terminal located at 42nd Street and Park Avenue in Midtown Manhattan, New York City. Grand Central is the southern terminus ...

New York City New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the L ...

: the gallery in front of the

Oyster Bar An oyster bar, also known as an oyster saloon, oyster house or a raw bar service, is a restaurant specializing in serving oysters, or a section of a restaurant which serves oysters buffet-style. Oysters have been consumed since ancient times and w ...

restaurant * The library inside Hammond Castle Museum in Gloucester, Massachusetts. * The Mapparium at The Mary Baker Eddy Library in Boston, Massachusetts allows visitors to enter the interior of a reflecting surface forming a nearly complete sphere * A whispering gallery can be found on the main floor of the

Museum of Science and Industry (Chicago) The Museum of Science and Industry (MSI) is a science museum located in Chicago, Illinois, in Jackson Park, in the Hyde Park neighborhood between Lake Michigan and The University of Chicago. It is housed in the former ''Palace of Fine Arts'' fr ...

* Statuary Hall in the

United States Capitol The United States Capitol, often called The Capitol or the Capitol Building, is the seat of the legislative branch of the United States federal government, which is formally known as the United States Congress. It is located on Capitol Hill ...

. * Salt Lake Tabernacle in

Salt Lake City Salt Lake City (often shortened to Salt Lake and abbreviated as SLC) is the capital and most populous city of Utah, United States. It is the seat of Salt Lake County, the most populous county in Utah. With a population of 200,133 in 2020, th ...

Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to its ...

* The rotunda at

San Francisco City Hall San Francisco City Hall is the seat of government for the City and County of San Francisco, California. Re-opened in 1915 in its open space area in the city's Civic Center, it is a Beaux-Arts monument to the City Beautiful movement that epitomi ...

. * Curved stone benches on either side of the Smith Memorial Arch in

Fairmount Park Fairmount Park is the largest municipal park in Philadelphia and the historic name for a group of parks located throughout the city. Fairmount Park consists of two park sections named East Park and West Park, divided by the Schuylkill River, wit ...

Philadelphia, Pennsylvania Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since ...

. * Centennial fountain in front of Green Library at

Stanford University Stanford University, officially Leland Stanford Junior University, is a private research university in Stanford, California. The campus occupies , among the largest in the United States, and enrolls over 17,000 students. Stanford is conside ...

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...

. * The rotunda of the

Texas State Capitol The Texas State Capitol is the capitol and seat of government of the American state of Texas. Located in downtown Austin, Texas, the structure houses the offices and chambers of the Texas Legislature and of the Governor of Texas. Designed in 1881 ...

and the

Missouri State Capitol The Missouri State Capitol is the home of the Missouri General Assembly and the executive branch of government of the U.S. state of Missouri. Located in Jefferson City at 201 West Capitol Avenue, it is the third capitol to be built in the cit ...

. * Gates Circle,

Buffalo, New York Buffalo is the second-largest city in the U.S. state of New York (behind only New York City) and the seat of Erie County. It is at the eastern end of Lake Erie, at the head of the Niagara River, and is across the Canadian border from Sou ...

. * The Whispering Arch in St. Louis Union StationWaymarking.com
St. Louis Union Station Whispering Arch
/ref> *

Charles Stover Charles Livingston Stover (July 9, 1866 – May 5, 1927) was an American football American football (referred to simply as football in the United States and Canada), also known as gridiron, is a team sport played by two teams of eleven p ...

Bench, Central Park, New York, New York * Waldo Hutchins Bench, Central Park, New York, New York * Center of the Universe, Tulsa, Oklahoma

Other parts of the world

Barossa Reservoir Barossa Reservoir is a reservoir in the Australian state of South Australia, built between 1899 and 1902 to supply water to Gawler and other northern country areas. Built at a cost of almost A£170,000 the reservoir was hailed on completion ...

Williamstown, South Australia Williamstown is a small South Australian town on the southern fringe of the Barossa Valley wine-growing region. It is 51 km north east of Adelaide and 16 km south-east of Gawler. Williamstown was originally known as ''Victoria Creek'' ...

. *

Cathedral of Brasília The Cathedral of Brasília (Portuguese: ''Catedral Metropolitana de Brasília'', "Metropolitan Cathedral of Brasília") is the Roman Catholic cathedral serving Brasília, Brazil, and serves as the seat of the Archdiocese of Brasília. It was des ...

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

. *

Martello tower Martello towers, sometimes known simply as Martellos, are small defensive forts that were built across the British Empire during the 19th century, from the time of the French Revolutionary Wars onwards. Most were coastal forts. They stand u ...

s. * The Echo Wall in the

Beijing } Beijing ( ; ; ), Chinese postal romanization, alternatively romanized as Peking ( ), is the Capital city, capital of the China, People's Republic of China. It is the center of power and development of the country. Beijing is the world's Li ...

. *

Masjed-e Imam The Shah Mosque ( fa, مسجد شاه) is a mosque located in Isfahan, Iran. It is located on the south side of Naghsh-e Jahan Square. It was built during the Safavid dynasty under the order of Shah Abbas I of Persia. It is regarded as one of ...

in Esfahān,

Iran Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...

. *

Basilica of St. John Lateran The Archbasilica Cathedral of the Most Holy Savior and of Saints John the Baptist and John the Evangelist in the Lateran ( it, Arcibasilica del Santissimo Salvatore e dei Santi Giovanni Battista ed Evangelista in Laterano), also known as the Papa ...

Rome , established_title = Founded , established_date = 753 BC , founder = King Romulus ( legendary) , image_map = Map of comune of Rome (metropolitan city of Capital Rome, region Lazio, Italy).svg , map_caption ...

. *

Santa Maria del Fiore Santa Claus, also known as Father Christmas, Saint Nicholas, Saint Nick, Kris Kringle, or simply Santa, is a legendary figure originating in Western Christian culture who is said to bring children gifts during the late evening and overnigh ...

Florence Cathedral Florence Cathedral, formally the (; in English Cathedral of Saint Mary of the Flower), is the cathedral of Florence, Italy ( it, Duomo di Firenze). It was begun in 1296 in the Gothic style to a design of Arnolfo di Cambio and was structurally co ...

* The

Church of the Holy Sepulcher The Church of the Holy Sepulchre, hy, Սուրբ Հարության տաճար, la, Ecclesia Sancti Sepulchri, am, የቅዱስ መቃብር ቤተክርስቲያን, he, כנסיית הקבר, ar, كنيسة القيامة is a church i ...

Jerusalem Jerusalem (; he, יְרוּשָׁלַיִם ; ar, القُدس ) (combining the Biblical and common usage Arabic names); grc, Ἱερουσαλήμ/Ἰεροσόλυμα, Hierousalḗm/Hierosóluma; hy, Երուսաղեմ, Erusałēm. i ...

. *

Leaning Tower of Nevyansk The Leaning Tower of Nevyansk (russian: Невья́нская ба́шня) is a tower in the town of Nevyansk in Sverdlovsk Oblast, Russia, built in the 18th century. Its construction was funded by Peter the Great's associate Akinfiy ...

Sverdlovsk Oblast Sverdlovsk Oblast ( rus, Свердловская область, Sverdlovskaya oblast) is a federal subject (an oblast) of Russia located in the Ural Federal District. Its administrative center is the city of Yekaterinburg, formerly known as ...

. * Selimiye Mosque in

Edirne Edirne (, ), formerly known as Adrianople or Hadrianopolis ( Greek: Άδριανούπολις), is a city in Turkey, in the northwestern part of the province of Edirne in Eastern Thrace. Situated from the Greek and from the Bulgarian borders ...

Turkey Turkey ( tr, Türkiye ), officially the Republic of Türkiye ( tr, Türkiye Cumhuriyeti, links=no ), is a transcontinental country located mainly on the Anatolian Peninsula in Western Asia, with a small portion on the Balkan Peninsula ...

. *

St. Peter's Basilica The Papal Basilica of Saint Peter in the Vatican ( it, Basilica Papale di San Pietro in Vaticano), or simply Saint Peter's Basilica ( la, Basilica Sancti Petri), is a church built in the Renaissance style located in Vatican City, the papal e ...

in the

Vatican City Vatican City (), officially the Vatican City State ( it, Stato della Città del Vaticano; la, Status Civitatis Vaticanae),—' * german: Vatikanstadt, cf. '—' (in Austria: ') * pl, Miasto Watykańskie, cf. '—' * pt, Cidade do Vati ...

. * Monument to the Negev Brigade in

Beersheba Beersheba or Beer Sheva, officially Be'er-Sheva ( he, בְּאֵר שֶׁבַע, ''Bəʾēr Ševaʿ'', ; ar, بئر السبع, Biʾr as-Sabʿ, Well of the Oath or Well of the Seven), is the largest city in the Negev desert of southern Israel. ...

Israel Israel (; he, יִשְׂרָאֵל, ; ar, إِسْرَائِيل, ), officially the State of Israel ( he, מְדִינַת יִשְׂרָאֵל, label=none, translit=Medīnat Yīsrāʾēl; ), is a country in Western Asia. It is situated ...

. * The Salle de Cariatides in the

Louvre The Louvre ( ), or the Louvre Museum ( ), is the world's most-visited museum, and an historic landmark in Paris, France. It is the home of some of the best-known works of art, including the ''Mona Lisa'' and the '' Venus de Milo''. A central ...

Paris Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. Si ...

France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...

. * The

Treasury of Atreus The Treasury of Atreus or Tomb of Agamemnon is a large ''tholos'' or beehive tomb constructed between 1350 and 1250 BC in Mycenae, Greece.Wace, A. J. (1940). The Treasury of Atreus. ''Antiquity, 14'', 233. ISSN 0003-598X The tomb was used for an ...

Greece Greece,, or , romanized: ', officially the Hellenic Republic, is a country in Southeast Europe. It is situated on the southern tip of the Balkans, and is located at the crossroads of Europe, Asia, and Africa. Greece shares land borders wi ...

* Secret's Chamber in

El Escorial El Escorial, or the Royal Site of San Lorenzo de El Escorial ( es, Monasterio y Sitio de El Escorial en Madrid), or Monasterio del Escorial (), is a historical residence of the King of Spain located in the town of San Lorenzo de El Escorial, u ...

Madrid Madrid ( , ) is the capital and most populous city of Spain. The city has almost 3.4 million inhabitants and a metropolitan area population of approximately 6.7 million. It is the second-largest city in the European Union (EU), and ...

Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = '' Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , ...

. * The Whispering Gallery in the

Alhambra The Alhambra (, ; ar, الْحَمْرَاء, Al-Ḥamrāʾ, , ) is a palace and fortress complex located in Granada, Andalusia, Spain. It is one of the most famous monuments of Islamic architecture and one of the best-preserved palaces of ...

Granada Granada (,, DIN: ; grc, Ἐλιβύργη, Elibýrgē; la, Illiberis or . ) is the capital city of the province of Granada, in the autonomous community of Andalusia, Spain. Granada is located at the foot of the Sierra Nevada mountains, at the c ...

. * Cleopatra's Bath in the

Siwa Oasis The Siwa Oasis ( ar, واحة سيوة, ''Wāḥat Sīwah,'' ) is an urban oasis in Egypt; between the Qattara Depression and the Great Sand Sea in the Western Desert, 50 km (30 mi) east of the Libyan border, and 560 km (348&nbs ...

Egypt Egypt ( ar, مصر , ), officially the Arab Republic of Egypt, is a List of transcontinental countries, transcontinental country spanning the North Africa, northeast corner of Africa and Western Asia, southwest corner of Asia via a land bridg ...

. * Ear of Dionysius cave in

Syracuse Syracuse may refer to: Places Italy * Syracuse, Sicily, or spelled as ''Siracusa'' * Province of Syracuse United States *Syracuse, New York **East Syracuse, New York ** North Syracuse, New York * Syracuse, Indiana *Syracuse, Kansas *Syracuse, M ...

Sicily (man) it, Siciliana (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = Ethnicity , demographics1_footnotes = , demographi ...

. *

Meštrović Pavilion The Meštrović Pavilion ( hr, Meštrovićev paviljon), also known as the Home of Croatian Artists () and colloquially as the Mosque (), is a cultural venue and the official seat of the Croatian Society of Fine Artists (HDLU) located on the Squ ...

Zagreb, Croatia Zagreb ( , , , ) is the capital and largest city of Croatia. It is in the northwest of the country, along the Sava river, at the southern slopes of the Medvednica mountain. Zagreb stands near the international border between Croatia and Slov ...

* Royal BC Museum in

Victoria, British Columbia, Canada Victoria is the capital city of the Canadian province of British Columbia, on the southern tip of Vancouver Island off Canada's Pacific coast. The city has a population of 91,867, and the Greater Victoria area has a population of 397,237. The ...

* Sacred Heart Cathedral, Wellington, New Zealand * The Whispering Arch (Flüsterbogen) in

Görlitz Görlitz (; pl, Zgorzelec, hsb, Zhorjelc, cz, Zhořelec, East Lusatian dialect: ''Gerlz'', ''Gerltz'', ''Gerltsch'') is a town in the German state of Saxony. It is located on the Lusatian Neisse River, and is the largest town in Upper Lus ...

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwee ...

. * Piazza Mercanti, Milan street *Whispering walls, Bologna, Italy

In science

The term ''whispering gallery'' has been borrowed in the physical sciences to describe other forms of whispering-gallery waves such as

light Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 t ...

matter wave Matter waves are a central part of the theory of quantum mechanics, being an example of wave–particle duality. All matter exhibits wave-like behavior. For example, a beam of electrons can be diffracted just like a beam of light or a water wav ...

References

External links

Ear of Dionysius
visiting information, videos and sounds of this cave.
Grand Central Station
visiting information, videos and sounds of the whispering gallery.
St Paul's Cathedral
visiting information, videos and sounds of the whispering gallery. {{portal bar, Architecture Acoustics Rooms